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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, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 3,840 |
Due after one year through five years, Amortized Cost | 12,565 |
Due after five years through ten years, Amortized Cost | 12,172 |
Due after ten years, Amortized Cost | 5,088 |
Total debt securities - available-for-sale, Amortized Cost | 43,697 | $ 39,669
Due in one year or less, Fair Value | 3,809 |
Due after one year through five years, Fair Value | 11,755 |
Due after five years through ten years, Fair Value | 10,608 |
Due after ten years, Fair Value | 4,519 |
Debt Securities, Available-for-sale | 39,554 | 40,217
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 330 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 257 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 34 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 20 |
Debt Securities, Held-to-maturity | 641 | 641
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 326 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 246 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 32 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 17 |
Debt Securities, Held-to-maturity, Fair Value | 621 | 643
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 6,868 |
Total debt securities - available-for-sale, Amortized Cost | 6,868 | 5,868
Mortgage-backed securities, Fair Value | 5,994 |
Debt Securities, Available-for-sale | 5,994 | 5,901
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 3,164 |
Total debt securities - available-for-sale, Amortized Cost | 3,164 | 2,819
Mortgage-backed securities, Fair Value | 2,869 |
Debt Securities, Available-for-sale | $ 2,869 | $ 2,838

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