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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]          
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets $ 3,305   $ 3,305   $ 3,025
Income Tax Credits And Other Tax Benefits From Qualified Affordable Housing Projects 1   1    
Affordable Housing Tax Credits and Other Tax Expense, Amount       $ 4  
Maximum [Member]          
Variable Interest Entity [Line Items]          
Affordable Housing Tax Credits and Other Tax Expense, Amount   $ 1      
Limited Partnerships and Limited Liability Companies [Member]          
Variable Interest Entity [Line Items]          
Carrying Amounts of our Investments in LPs and LLCs, As Recognized In Other Investments on our Consolidated Balance Sheets 2,700   2,700   2,100
Carrying Amount Of Investments In Qualified Affordable Housing Projects $ 5   $ 5   $ 7