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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Variable Interest Entity [Line Items] |  |  |  |  |
Gains (losses) for consolidated variable interest entities | $ 0 | $ 0 | $ 0 | $ 0 |
Carrying amount of other investments | 4,069 |  | 4,069 |  | $ 3,984
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects | 1 |  | 1 |  |
Income tax expense |  |  |  | $ (4) |
Maximum [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Income tax expense |  | $ 1 |  |  |
Limited Partnerships and Limited Liability Companies [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of other investments | 2,700 |  | 2,700 |  | 2,100
Carrying Amount Of Investments In Qualified Affordable Housing Projects | $ 5 |  | $ 5 |  | $ 7

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- Definition The carrying amount of our investments in qualified affordable housing projects which are recognized in other investments on our Consolidated Balance Sheets. + References No definition available. + Details
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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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