Deferred Tax - Summary of Tax Losses and Other Tax Attributes (Detail)
$ in Millions |
Dec. 31, 2021
USD ($)
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Tax Value |
$ 1,446
|
| Unrecognized Deferred Tax Assets |
(1,179)
|
| Net Deferred Tax Assets |
267
|
| Unused tax losses [member] | Canada [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Carry Forward Loss/Tax Attributes |
2,234
|
| Tax Value |
592
|
| Unrecognized Deferred Tax Assets |
(580)
|
| Net Deferred Tax Assets |
12
|
| Unused tax losses [member] | Other Jurisdictions [Member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Carry Forward Loss/Tax Attributes |
1,798
|
| Tax Value |
461
|
| Unrecognized Deferred Tax Assets |
(373)
|
| Net Deferred Tax Assets |
88
|
| Capital Losses [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Carry Forward Loss/Tax Attributes |
753
|
| Tax Value |
193
|
| Unrecognized Deferred Tax Assets |
(130)
|
| Net Deferred Tax Assets |
63
|
| Investment in subsidiaries [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Carry Forward Loss/Tax Attributes |
292
|
| Tax Value |
73
|
| Unrecognized Deferred Tax Assets |
(73)
|
| Net Deferred Tax Assets |
0
|
| Other deductible temporary differences [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Carry Forward Loss/Tax Attributes |
32
|
| Tax Value |
10
|
| Unrecognized Deferred Tax Assets |
(10)
|
| Net Deferred Tax Assets |
0
|
| U.S. state net operating losses [member] | U.S. [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Tax Value |
5
|
| Unrecognized Deferred Tax Assets |
(3)
|
| Net Deferred Tax Assets |
2
|
| Other attributes and credits [member] |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |
|
| Tax Value |
112
|
| Unrecognized Deferred Tax Assets |
(10)
|
| Net Deferred Tax Assets |
$ 102
|