Statement Of Financial Position [Abstract]

BAE Systems PLC - Filing #1592114

Concept	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-12-31	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2021-01-01	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-12-31	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01	As at 2020-01-01
Statement of financial position [abstract]
Assets [abstract]
Property, plant and equipment	—	—	2, 852 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2, 655 GBP	—	—	—	—	—	—	—
Right-of-use assets	—	—	1,0 91 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1, 0 5 3 GBP	—	—	—	—	—	—	—
Investment property	—	—	67,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	12 8 GBP	—	—	—	—	—	—	—
Investments accounted for using equity method	—	—	554,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	409,000,000 GBP	—	—	—	—	—	—	—
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners	—	—	– GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	94,000,000 GBP	—	—	—	—	—	—	—
Current tax assets	—	—	71,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	6,000,000 GBP	—	—	—	—	—	—	—
Deferred tax assets	—	—	622,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	972,000,000 GBP	—	—	—	—	—	—	—
Cash and cash equivalents	—	—	2 , 9 17 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2,76 8 GBP	—	—	—	—	—	—	—
Assets	—	—	2 7,1 3 5 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2 7, 5 3 0 GBP	—	—	—	—	—	—	—
Equity and liabilities [abstract]
Equity [abstract]
Issued capital	—	—	85,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	87,000,000 GBP	—	—	—	—	—	—	—
Retained earnings	—	—	212,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	2 ,6 1 6 GBP	—	—	—	—	—	—	—
Share premium	—	—	1,252,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	1, 2 4 9 GBP	—	—	—	—	—	—	—
Other reserves	—	—	5,8 87 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	5 ,923 GBP	—	—	—	—	—	—	—
Equity attributable to owners of parent	—	—	7, 4 3 6 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	4,6 43 GBP	—	—	—	—	—	—	—
Non-controlling interests	—	—	232,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	278,000,000 GBP	—	—	—	—	—	—	—
Equity	212,000,000 GBP	5, 887 GBP	7, 6 6 8 GBP	7, 4 3 6 GBP	1,252,000,000 GBP	232,000,000 GBP	85,000,000 GBP	87,000,000 GBP	4 , 921 GBP	2,6 1 6 GBP	5,923,000,000 GBP	1, 2 4 9 GBP	4, 643 GBP	278,000,000 GBP	2,6 1 6 GBP	278,000,000 GBP	4, 643 GBP	87,000,000 GBP	5,923,000,000 GBP	1, 2 4 9 GBP	4 , 921 GBP	87,000,000 GBP	2,0 8 5 GBP	5,5 1 1 GBP	6 ,1 5 6 GBP	10 4 GBP	1, 2 4 9 GBP	5, 4 07 GBP
Liabilities [abstract]
Current tax liabilities	—	—	27,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	72,000,000 GBP	—	—	—	—	—	—	—
Deferred tax liabilities	—	—	77,000,000 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	– GBP	—	—	—	—	—	—	—
Liabilities	—	—	19,4 67 GBP	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	—	22 ,609 GBP	—	—	—	—	—	—	—