Statement Of Cash Flows [Abstract]
| Concept |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
As at 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] | |||||
| 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
|