Taxation - Schedule of Reconciliation of Income Tax Expense Benefit (Detail) - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
| Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |
|
|
| Income before tax |
$ 7,294
|
$ 1,220
|
| Income before tax multiplied by the standard rate of Canadian corporate tax of [26.5]% |
1,933
|
323
|
| Income taxes recorded at rates different from the Canadian tax rate |
(335)
|
(167)
|
| Tax losses for which no benefit is recognized |
21
|
1
|
| Net (non-taxable) non-deductible foreign exchange and other gains and losses |
(3)
|
6
|
| Tax on reversal of statutory intercompany investment values |
34
|
905
|
| Recognition of tax losses that arose in prior years due to changes in statutory intercompany investment values |
(34)
|
(905)
|
| Provision for uncertain tax positions |
5
|
10
|
| Recognition of tax losses that arose in prior years |
(3)
|
(138)
|
| U.S. base erosion minimum tax |
|
43
|
| Impact of tax law changes |
(17)
|
|
| Research and development credits |
(10)
|
(12)
|
| Other adjustments related to prior years |
11
|
(6)
|
| Withholding taxes |
8
|
6
|
| Other differences |
(3)
|
5
|
| Total tax expense |
$ 1,607
|
$ 71
|