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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 42,814 | $ 39,669
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 33 | 822
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,843) | (274)
Debt Securities, Available-for-sale | 40,004 | 40,217
Held-to-maturity securities, Amortized Cost | 714 | 641
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (13) | (2)
Debt Securities, Held-to-maturity, Fair Value | 701 | 643
Total debt securities, Amortized Cost | 43,528 | 40,310
Total debt securities, Gross Unrealized Gains | 33 | 826
Total debt securities, Gross Unrealized Losses | (2,856) | (276)
Debt securities, Fair Value Disclosure | 40,705 | 40,860
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 40,004 | 40,217
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,808 | 3,206
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1 | 23
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (209) | (31)
Debt Securities, Available-for-sale | 3,600 | 3,198
Held-to-maturity securities, Amortized Cost | 544 | 511
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (11) | (2)
Debt Securities, Held-to-maturity, Fair Value | 533 | 511
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 7,725 | 6,829
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 25 | 297
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (381) | (20)
Debt Securities, Available-for-sale | 7,369 | 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 | (2) | 0
Debt Securities, Held-to-maturity, Fair Value | 27 | 32
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 22,080 | 20,947
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 5 | 372
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,515) | (145)
Debt Securities, Available-for-sale | 20,570 | 21,174
Held-to-maturity securities, Amortized Cost | 141 | 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 | 141 | 100
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,275 | 5,868
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 2 | 88
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (537) | (55)
Debt Securities, Available-for-sale | 5,740 | 5,901
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,926 | 2,819
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 0 | 42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (201) | (23)
Debt Securities, Available-for-sale | $ 2,725 | $ 2,838

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