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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 15,596 |  |
Other comprehensive income before reclassification, net of income taxes | 860 | $ (80) |
Amounts reclassified from accumulated other comprehensive income, net of income taxes | (16) | 54 |
Amounts reclassified from accumulated other comprehensive income resulting from new federal corporate income tax rate |  | (13) |
Total other comprehensive income (loss), net of tax | 844 | (39) | $ (238)
Ending Balance | 17,038 | 15,596 |
Unrealized Gains (Losses) on Securities Available for Sale [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (373) | (311) |
Other comprehensive income before reclassification, net of income taxes | 503 | (62) |
Amounts reclassified from accumulated other comprehensive income, net of income taxes | (15) | 0 |
Amounts reclassified from accumulated other comprehensive income resulting from new federal corporate income tax rate |  | 0 |
Total other comprehensive income (loss), net of tax | 488 | (62) |
Ending Balance | 115 | (373) | (311)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (50) | (86) |
Other comprehensive income before reclassification, net of income taxes | 335 | 7 |
Amounts reclassified from accumulated other comprehensive income, net of income taxes | (35) | 29 |
Amounts reclassified from accumulated other comprehensive income resulting from new federal corporate income tax rate |  | 0 |
Total other comprehensive income (loss), net of tax | 300 | 36 |
Ending Balance | 250 | (50) | (86)
Foreign Currency Translation Adjustment [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (14) | 9 |
Other comprehensive income before reclassification, net of income taxes | 3 | (10) |
Amounts reclassified from accumulated other comprehensive income, net of income taxes | 11 | 0 |
Amounts reclassified from accumulated other comprehensive income resulting from new federal corporate income tax rate |  | (13) |
Total other comprehensive income (loss), net of tax | 14 | (23) |
Ending Balance | 0 | (14) | 9
Net Pension and Postretirement Benefit Costs [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (381) | (391) |
Other comprehensive income before reclassification, net of income taxes | 19 | (15) |
Amounts reclassified from accumulated other comprehensive income, net of income taxes | 23 | 25 |
Amounts reclassified from accumulated other comprehensive income resulting from new federal corporate income tax rate |  | 0 |
Total other comprehensive income (loss), net of tax | 42 | 10 |
Ending Balance | (339) | (381) | (391)
AOCI Attributable to Parent [Member] |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (818) | (779) | (541)
Total other comprehensive income (loss), net of tax | 844 | (39) | (238)
Ending Balance | $ 26 | $ (818) | $ (779)

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