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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 41,321 | $ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 125 | 822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,603) | (274)
Debt Securities, Available-for-sale | 39,843 | 40,217
Held-to-maturity securities, Amortized Cost | 626 | 641
Securities, Held to maturity, Unrecognized Holding Gain | 1 | 4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (9) | (2)
Debt Securities, Held-to-maturity, Fair Value | 618 | 643
Total debt securities, Amortized Cost | 41,947 | 40,310
Total debt securities, Gross Unrealized Gains | 126 | 826
Total debt securities, Gross Unrealized Losses | (1,612) | (276)
Debt securities, Fair Value Disclosure | 40,461 | 40,860
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 39,843 | 40,217
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,507 | 3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 4 | 23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (140) | (31)
Debt Securities, Available-for-sale | 3,371 | 3,198
Held-to-maturity securities, Amortized Cost | 510 | 511
Securities, Held to maturity, Unrecognized Holding Gain | 1 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (9) | (2)
Debt Securities, Held-to-maturity, Fair Value | 502 | 511
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,022 | 6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 57 | 297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (224) | (20)
Debt Securities, Available-for-sale | 6,855 | 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 | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 29 | 32
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 21,669 | 20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 55 | 372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (811) | (145)
Debt Securities, Available-for-sale | 20,913 | 21,174
Held-to-maturity securities, Amortized Cost | 87 | 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 | 87 | 100
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,210 | 5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 7 | 88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (316) | (55)
Debt Securities, Available-for-sale | 5,901 | 5,901
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,913 | 2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 2 | 42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (112) | (23)
Debt Securities, Available-for-sale | $ 2,803 | $ 2,838

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