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Investments (Amortized Cost and Fair Value of Available-for-Sale Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Due in one year or less, Amortized Cost | $ 3,439 |
Due after one year through five years, Amortized Cost | 13,237 |
Due after five years through ten years, Amortized Cost | 12,332 |
Due after ten years, Amortized Cost | 4,605 |
Total debt securities - available-for-sale, Amortized Cost | 42,814 | $ 39,669
Due in one year or less, Fair Value | 3,422 |
Due after one year through five years, Fair Value | 12,672 |
Due after five years through ten years, Fair Value | 11,213 |
Due after ten years, Fair Value | 4,232 |
Debt Securities, Available-for-sale | 40,004 | 40,217
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 385 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 295 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 14 |
Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 20 |
Debt Securities, Held-to-maturity | 714 | 641
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value | 381 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 288 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 13 |
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 19 |
Debt Securities, Held-to-maturity, Fair Value | 701 | 643
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 6,275 |
Total debt securities - available-for-sale, Amortized Cost | 6,275 | 5,868
Mortgage-backed securities, Fair Value | 5,740 |
Debt Securities, Available-for-sale | 5,740 | 5,901
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Mortgage-backed securities, Amortized Cost | 2,926 |
Total debt securities - available-for-sale, Amortized Cost | 2,926 | 2,819
Mortgage-backed securities, Fair Value | 2,725 |
Debt Securities, Available-for-sale | $ 2,725 | $ 2,838

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