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Income Taxes - Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Income Tax Disclosure [Abstract]                        
Provision for income taxes $ 48 $ 39 $ 35 $ 35 $ 34 $ 58 $ 82 $ 92 $ 157 $ 266 $ 1,228  
Income tax expense (benefit) included in common equity related to:                        
Unrealized gains (losses) on investment securities                 128 (68) 127  
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread                 (98) 103 (115)  
Unrealized gains (losses) on derivatives designated as cash flow hedges                 3      
Unrealized gains (losses) on derivatives designated as cash flow hedges                   12 (5)  
Employer accounting for post-retirement plans                 (5) 3 1  
Cumulative effect adjustment to initially apply new accounting guidance for stranded tax effects resulting from Tax Legislation(1) [1]                       $ 91
Total income taxes                 $ 185 $ 407 $ 1,236  
[1] Reflects the adoption of new accounting guidance in 2018 which resulted in a cumulative effect adjustment as of January 1, 2018 to reclassify the stranded tax effects resulting from the change in the Federal corporate income tax rate discussed above from accumulated other comprehensive loss to retained earnings