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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Additional Information [Line Items] |  |  |  |  |
Tax benefit recognized from IRS approved method change | $ 284 |  |  |  |
Charges associated with impacts of the Tax Act |  | $ 1,800 |  |  |
Pre-tax earnings from foreign operations |  |  | $ 215 | $ 382 | $ 410
Other comprehensive income (loss), provision (benefit) |  |  | 447 | 15 | (134)
Accrued interest and penalties expense (benefit) related to income taxes included in income tax expense |  |  | 4 | 6 | 5
Provisional liability accrued for repatriation of undistributed foreign earnings | 111 |  |  | 111 |
Undistributed earnings of foreign subsidiaries | 1,500 |  |  | 1,500 |
Amount of unrecognized deferred tax liability, bad debt reserve for tax purposes of qualified lender |  |  | 69 |  |
Bad debt reserve for tax purposes of qualified lender |  |  | 287 |  |
Internal Revenue Service (IRS) |  |  |  |  |
Additional Information [Line Items] |  |  |  |  |
Operating loss carryforwards | 1 |  | 31 | 1 |
Operating loss carryforwards, no expiration |  |  | 12 |  |
State and Local Jurisdiction |  |  |  |  |
Additional Information [Line Items] |  |  |  |  |
Operating loss carryforwards | 253 |  | 237 | 253 |
Foreign Tax Authority |  |  |  |  |
Additional Information [Line Items] |  |  |  |  |
Operating loss carryforwards | $ 19 |  | 40 | 19 |
AOCI |  |  |  |  |
Additional Information [Line Items] |  |  |  |  |
Other comprehensive income (loss), provision (benefit) |  |  | $ 727 | $ 15 | $ (134)

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