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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 39,874 | $ 38,079
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 1,215 | 1,771
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (237) | (22)
Debt Securities, Available-for-sale | 40,852 | 39,828
Held-to-maturity securities, Amortized Cost | 639 | 638
Securities, Held to maturity, Unrecognized Holding Gain | 7 | 9
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 646 | 647
Total debt securities, Amortized Cost | 40,513 | 38,717
Total debt securities, Gross Unrealized Gains | 1,222 | 1,780
Total debt securities, Gross Unrealized Losses | (237) | (22)
Debt securities, Fair Value Disclosure | 41,498 | 40,475
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 40,852 | 39,828
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,372 | 3,335
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 86 | 133
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (26) | (3)
Debt Securities, Available-for-sale | 3,432 | 3,465
Held-to-maturity securities, Amortized Cost | 418 | 420
Securities, Held to maturity, Unrecognized Holding Gain | 5 | 6
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 423 | 426
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,941 | 6,893
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 345 | 435
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (22) | 0
Debt Securities, Available-for-sale | 7,264 | 7,328
Held-to-maturity securities, Amortized Cost | 31 | 31
Securities, Held to maturity, Unrecognized Holding Gain | 2 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 33 | 33
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 20,395 | 18,886
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 533 | 863
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (122) | (12)
Debt Securities, Available-for-sale | 20,806 | 19,737
Held-to-maturity securities, Amortized Cost | 190 | 187
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 1
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 190 | 188
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,784 | 6,849
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 185 | 245
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (48) | (3)
Debt Securities, Available-for-sale | 6,921 | 7,091
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,382 | 2,116
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 66 | 95
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (19) | (4)
Debt Securities, Available-for-sale | $ 2,429 | $ 2,207

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