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Stockholders' Equity - Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Before Tax |  |  |
Net unrealized gains (losses) on securities available for sale | $ 1,659 | $ 855 | $ (605)
Net unrealized gains (losses) on hedging relationships | 1,329 | 1,016 | (98)
Foreign currency translation adjustments | 56 | 54 | 9
Net changes in securities held to maturity | 0 | 36 | 588
Other | 4 | 17 | (15)
Other comprehensive income (loss), before tax | 3,048 | 1,978 | (121)
Provision (Benefit) |  |  |
Net unrealized gains (losses) on securities available for sale | 400 | 205 | (146)
Net unrealized gains (losses) on hedging relationships | 321 | 244 | (24)
Foreign currency translation adjustments | (20) | (16) | 48
Net changes in securities held to maturity | 0 | 10 | 141
Other | 1 | 4 | (4)
Other comprehensive income (loss), provision (benefit) | 702 | 447 | 15
After Tax |  |  |
Net unrealized gains (losses) on securities available for sale | 1,259 | 650 | (459)
Net unrealized gains (losses) on hedging relationships | 1,008 | 772 | (74)
Foreign currency translation adjustments | 76 | 70 | (39)
Net changes in securities held to maturity | 0 | 26 | 447
Other | 3 | 13 | (11)
Other comprehensive income (loss), net of tax | $ 2,346 | $ 1,531 | $ (136)

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