Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
As at 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
2020-01-01 to 2020-12-31 |
As at 2019-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||||||||||
| Cash flows from (used in) operating activities [abstract] | |||||||||||||
| Profit (loss) | — |
–
USD
|
–
USD
|
–
USD
|
167,000,000
USD
|
167,000,000
USD
|
33,000,000
USD
|
— |
–
USD
|
33,000,000
USD
|
–
USD
|
–
USD
|
— |
| Interest paid, classified as operating activities | — | — | — | — |
–
USD
|
— | — | — | — |
0
USD
|
— | — | — |
| Interest received, classified as operating activities | — | — | — | — |
–
USD
|
— | — | — | — |
1,000,000
USD
|
— | — | — |
| Cash flows from (used in) operating activities | — | — | — | — |
649,000,000
USD
|
— | — | — | — |
521,000,000
USD
|
— | — | — |
| Cash flows from (used in) investing activities [abstract] | |||||||||||||
| Cash flows from (used in) investing activities | — | — | — | — |
352,000,000
USD
|
— | — | — | — |
454,000,000
USD
|
— | — | — |
| Cash flows from (used in) financing activities [abstract] | |||||||||||||
| Dividends paid, classified as financing activities | — | — | — | — |
78,000,000
USD
|
— | — | — | — |
70,000,000
USD
|
— | — | — |
| Cash flows from (used in) financing activities | — | — | — | — |
165,000,000
USD
|
— | — | — | — |
259,000,000
USD
|
— | — | — |
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — | — | — | — |
132,000,000
USD
|
— | — | — | — |
192,000,000
USD
|
— | — | — |
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||||||||||
| Effect of exchange rate changes on cash and cash equivalents | — | — | — | — |
0
USD
|
— | — | — | — |
10,000,000
USD
|
— | — | — |
| Cash and cash equivalents |
686,000,000
USD
|
— | — | — | — | — | — |
554,000,000
USD
|
— | — | — | — |
756,000,000
USD
|