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Investments (Short-Term and Long-Term Investments) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 35,233 | $ 35,328
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 867 | 795
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (468) | (29)
Debt Securities, Available-for-sale | 35,632 | 36,094
Held-to-maturity securities, Amortized Cost | 725 | 972
Securities, Held to maturity, Unrecognized Holding Gain | 11 | 4
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1) | (1)
Debt Securities, Held-to-maturity, Fair Value | 735 | 975
Total debt securities, Amortized Cost | 35,958 | 36,300
Total debt securities, Gross Unrealized Gains | 878 | 799
Total debt securities, Gross Unrealized Losses | (469) | (30)
Debt securities, Fair Value Disclosure | 36,367 | 37,069
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale | 35,632 | 36,094
U.S. Government and Agency Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,146 | 3,502
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 183 | 55
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1) | (4)
Debt Securities, Available-for-sale | 3,328 | 3,553
Held-to-maturity securities, Amortized Cost | 410 | 402
Securities, Held to maturity, Unrecognized Holding Gain | 9 | 2
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | 419 | 404
State and Municipal Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,724 | 5,680
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 214 | 251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (20) | (5)
Debt Securities, Available-for-sale | 5,918 | 5,926
Held-to-maturity securities, Amortized Cost | 31 | 32
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 | 34
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 17,923 | 17,910
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 182 | 343
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (411) | (11)
Debt Securities, Available-for-sale | 17,694 | 18,242
Held-to-maturity securities, Amortized Cost | 284 | 538
Securities, Held to maturity, Unrecognized Holding Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (1) | (1)
Debt Securities, Held-to-maturity, Fair Value | 283 | 537
U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,508 | 6,425
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 260 | 109
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | (6)
Debt Securities, Available-for-sale | 6,768 | 6,528
Non-U.S. Agency Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,932 | 1,811
Securities, Available for sale Debt Securities, Gross Unrealized Gains | 28 | 37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (36) | (3)
Debt Securities, Available-for-sale | $ 1,924 | $ 1,845

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