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Accounting Changes - Credit Losses (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounting Changes    
Deferred tax assets $ 8,852 $ 5,182
Retained earnings $ 162,806 162,954
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment    
Accounting Changes    
Allowance for credit losses   81
Deferred tax assets   (14)
Retained earnings   $ (66)