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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) | Dec. 31, 2019 | Oct. 21, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Finance lease liabilities | $ 13,000,000 |  |
Total long-term debt | 12,448,000,000 |  | $ 13,732,000,000
Real Estate Loans and securities pledged | 121,000,000 |  | 1,100,000,000
Senior Medium-Term Notes Due Through 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior medium-term notes | $ 4,111,000,000 |  | $ 3,278,000,000
Long-term debt weighted average interest rate | 3.7815% |  | 4.057%
3.136% Subordinated notes due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 3.136% |  |
Subordinated long-term notes | $ 162,000,000 |  | $ 162,000,000
6.875% Subordinated Notes Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 6.875% |  |
Subordinated long-term notes | $ 109,000,000 |  | 104,000,000
7.750% Subordinated Notes Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 7.75% |  |
Subordinated long-term notes | $ 141,000,000 |  | 135,000,000
7.25% Subordinated notes due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 7.25% |  |
Subordinated long-term notes | $ 324,000,000 |  | $ 336,000,000
Long-term debt weighted average interest rate | 7.25% |  | 7.25%
6.75% Senior Notes Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 6.75% | 6.75% |
Subordinated long-term notes | $ 0 |  | $ 315,000,000
Long-term debt weighted average interest rate |  |  | 6.75%
Aggregate principal amount |  | $ 300,000,000 |
Other Subordinated Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Subordinated long-term notes | $ 71,000,000 |  | $ 70,000,000
Long-term debt weighted average interest rate | 3.42% |  | 4.20%
Senior Medium-Term Notes Due Through 2039 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior medium-term notes | $ 5,874,000,000 |  | $ 7,022,000,000
Long-term debt weighted average interest rate | 2.595% |  | 2.593%
3.18% Senior Remarketable Notes Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 3.18% |  |
Subordinated long-term notes | $ 222,000,000 |  | $ 212,000,000
Long-term debt weighted average interest rate | 3.18% |  | 3.18%
3.40% Subordinated notes due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 3.40% |  |
Subordinated long-term notes | $ 589,000,000 |  | $ 560,000,000
6.95% Subordinated notes due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 6.95% |  |
Subordinated long-term notes | $ 299,000,000 |  | 299,000,000
3.90% Subordinated notes due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 3.90% |  |
Subordinated long-term notes | $ 371,000,000 |  | 0
Secured Borrowing Due Through 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Secured borrowing due through 2025 | $ 15,000,000 |  | $ 10,000,000
Long-term debt weighted average interest rate | 4.445% |  | 4.455%
Federal Home Loan Bank Advances Due Through 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Federal Home Loan Bank advances due through 2038 | $ 121,000,000 |  | $ 1,130,000,000
Long-term debt weighted average interest rate | 3.506% |  | 2.333%
Investment Fund Financing Due Through 2052 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Investment Fund Financing due through 2052 | $ 26,000,000 |  | $ 83,000,000
Long-term debt weighted average interest rate | 1.63% |  | 1.85%
Obligations Under Capital Lease Due Through 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Finance lease liabilities | $ 13,000,000 |  | $ 16,000,000
Key [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | 4,918,000,000 |  | 4,400,000,000
Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt | $ 7,530,000,000 |  | $ 9,332,000,000

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