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Derivative Instruments and Hedging Activities - Hedged Items in Fair Value Hedging Relationship (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Hedged Items In Fair Value Hedging Relationship [Line Items] |  |
Amortized cost of closed prepayment assets | $ 5,900 | $ 8,300
Amortized cost of closed prepayable assets, designated hedged items | 3,100 | 4,000
Hedged assets cumulative basis adjustment | 75 | 26
Available-for-sale securities |  |
Hedged Items In Fair Value Hedging Relationship [Line Items] |  |
Carrying Amount of Assets | 10,825 | 14,067
Hedged Assets, Fair Value Hedge, Cumulative Increase (Decrease) | 300 | (6)
Hedged Assets, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 52 | (2)
Interest-bearing deposits |  |
Hedged Items In Fair Value Hedging Relationship [Line Items] |  |
Carrying Amount Of Liabilities | (14,310) | (13,101)
Hedged Liabilities, Fair Value Hedge, Cumulative Increase (Decrease) | (12) | 247
Hedged Liabilities, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 0 | 0
Securitized debt obligations |  |
Hedged Items In Fair Value Hedging Relationship [Line Items] |  |
Carrying Amount Of Liabilities | (9,403) | (5,887)
Hedged Liabilities, Fair Value Hedge, Cumulative Increase (Decrease) | 44 | 168
Hedged Liabilities, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | 64 | 143
Senior and subordinated notes |  |
Hedged Items In Fair Value Hedging Relationship [Line Items] |  |
Carrying Amount Of Liabilities | (27,777) | (23,572)
Hedged Liabilities, Fair Value Hedge, Cumulative Increase (Decrease) | (458) | 315
Hedged Liabilities, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) | $ 324 | $ 392

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