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Income Taxes - Continuing Operations (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                      
Provision (benefit) for income taxes $ 907 $ 61 $ 108 $ 152 $ (11) $ 26 $ (5) $ 79 $ 1,228 $ 89 $ 230
Income tax expense (benefit) included in common equity related to:                      
Unrealized gains (losses) on investment securities                 127 (135) (242)
Unrealized gains (losses) on fair value option liabilities attributable to our own credit spread(1) [1]                 (115) 0 0
Unrealized gains (losses) on derivatives designated as cash flow hedges                 (5) 9 2
Employer accounting for post-retirement plans                 1 2 0
Total income taxes                 $ 1,236 $ (35) $ (10)
[1] See Note 2, "Summary of Significant Accounting Policies and New Accounting Pronouncements," for information on the adoption of new accounting guidance on January 1, 2017 related to fair value option liabilities attributable to our own credit spread.