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Stockholders' Equity - Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Before Tax        
Net unrealized gains (losses) on securities available for sale $ 292 $ 358 $ 1,902 $ 742
Net unrealized gains (losses) on hedging relationships 76 708 1,884 1,073
Foreign currency translation adjustments 20 33 (1) 52
Net changes in securities held to maturity 0 9   16
Other 0 (1) 0 (3)
Other comprehensive income (loss), before tax 388 1,107 3,785 1,880
Provision (Benefit)        
Net unrealized gains (losses) on securities available for sale 70 86 456 178
Net unrealized gains (losses) on hedging relationships 19 171 453 259
Foreign currency translation adjustments (3) 18 43 7
Net changes in securities held to maturity 0 3 0 4
Other 0 (1) 0 (1)
Other comprehensive income (loss), provision (benefit) 86 277 952 447
After Tax        
Net unrealized gains (losses) on securities available for sale 222 272 1,446 564
Net unrealized gains (losses) on hedging relationships 57 537 1,431 814
Foreign currency translation adjustments 23 15 (44) 45
Net changes in securities held to maturity 0 6 0 12
Other 0 0 0 (2)
Other comprehensive income, net of tax $ 302 $ 830 $ 2,833 $ 1,433