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Fair Value Measurements (Hybrid Notes) (Details) - Net investment in United States dollar denominated operations - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Hybrid Instruments [Line Items] |  |
Hybrid Notes as a hedge of the foreign currency exposure | $ 1,200 |
After-tax foreign currency gain (loss) | $ 26 | $ 78

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- Definition Fair value as of the balance sheet date of hybrid instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116690713&loc=d3e50806-113969 + Details
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- Definition Amount of the unrealized gain (loss) in earnings for the period from the increase (decrease) in fair value on hybrid instruments measured at fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35708913&loc=d3e50876-113970 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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