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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 2,871 |
Due after one year through five years, Amortized Cost | 13,492 |
Due after five years through ten years, Amortized Cost | 12,062 |
Due after ten years, Amortized Cost | 4,280 |
Total debt securities - available-for-sale, Amortized Cost | 41,749 | $ 38,079
Due in one year or less, Fair Value | 2,886 |
Due after one year through five years, Fair Value | 13,826 |
Due after five years through ten years, Fair Value | 12,406 |
Due after ten years, Fair Value | 4,423 |
Debt Securities, Available-for-sale | 42,757 | 39,828
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 234 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 333 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 26 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 23 |
Debt Securities, Held-to-maturity | 616 | 638
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 235 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 334 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 27 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 24 |
Debt Securities, Held-to-maturity, Fair Value | 620 | 647
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 6,281 |
Total debt securities - available-for-sale, Amortized Cost | 6,281 | 6,849
Mortgage-backed securities, Fair Value | 6,403 |
Debt Securities, Available-for-sale | 6,403 | 7,091
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,763 |
Total debt securities - available-for-sale, Amortized Cost | 2,763 | 2,116
Mortgage-backed securities, Fair Value | 2,813 |
Debt Securities, Available-for-sale | $ 2,813 | $ 2,207

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