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Variable Interest Entities - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |
Investments in LIHTC operating partnerships | $ 282,000,000 | $ 248,000,000
Total Liabilities | 1,000,000 | 2,000,000
Assets that can only be used to settle entities' obligations |  | 0
Variable interest entity, liabilities |  | 0
LIHTC Investments [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in LIHTC operating partnerships | 6,405,000,000 | 5,932,000,000
Total Liabilities | 2,526,000,000 | 2,569,000,000
LIHTC Investments [Member] | Qualified affordable housing projects investment [Member] |  |
Variable Interest Entity [Line Items] |  |
Total Liabilities | 546,000,000 | 532,000,000
Accrued Income And Other Assets [Member] | LIHTC Investments [Member] |  |
Variable Interest Entity [Line Items] |  |
Investments in LIHTC operating partnerships | 1,500,000,000 | 1,400,000,000
Investments [Member] | LIHTC Investments [Member] |  |
Variable Interest Entity [Line Items] |  |
Amortization of investment | 187,000,000 | 170,000,000
Tax credit of investment | 184,000,000 | 166,000,000
Investments [Member] | Guaranteed Funds [Member] |  |
Variable Interest Entity [Line Items] |  |
Assets that can only be used to settle entities' obligations | 0 |
Variable interest entity, liabilities | 0 |
Fair Value, Recurring [Member] |  |
Variable Interest Entity [Line Items] |  |
Other investments | $ 90,000,000 | $ 115,000,000

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