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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 45,926 | $ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 59 | 822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (3,664) | (274)
Debt Securities, Available-for-sale | 42,321 | 40,217
Held-to-maturity securities, Amortized Cost | 696 | 641
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (17) | (2)
Debt Securities, Held-to-maturity, Fair Value | 679 | 643
Total investments, Amortized Cost | 46,622 | 40,310
Total investments, Gross Unrealized Gains | 59 | 826
Total investments, Gross Unrealized Losses | (3,681) | (276)
Investments, Fair Value Disclosure | 43,000 | 40,860
Debt Securities - held-to-maturity |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 42,321 | 40,217
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,093 | 3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (285) | (31)
Debt Securities, Available-for-sale | 3,809 | 3,198
Held-to-maturity securities, Amortized Cost | 578 | 511
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (14) | (2)
Debt Securities, Held-to-maturity, Fair Value | 564 | 511
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,702 | 6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 25 | 297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (479) | (20)
Debt Securities, Available-for-sale | 7,248 | 7,106
Held-to-maturity securities, Amortized Cost | 29 | 30
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (3) | 0
Debt Securities, Held-to-maturity, Fair Value | 26 | 32
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 23,675 | 20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 17 | 372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,798) | (145)
Debt Securities, Available-for-sale | 21,894 | 21,174
Held-to-maturity securities, Amortized Cost | 89 | 100
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 89 | 100
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,379 | 5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 15 | 88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (808) | (55)
Debt Securities, Available-for-sale | 6,586 | 5,901
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,077 | 2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (294) | (23)
Debt Securities, Available-for-sale | $ 2,784 | $ 2,838

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