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Investments (Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 48,668 $ 45,926
Securities, Available for sale Debt Securities, Gross Unrealized Gains 6 59
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,322) (3,664)
Debt Securities, Available-for-sale 44,352 42,321
Held-to-maturity securities, Amortized Cost 682 696
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (15) (17)
Debt Securities, Held-to-maturity, Fair Value 667 679
Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value 45,019 43,000
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss (4,337) (3,681)
Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain 6 59
Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost 49,350 46,622
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale 44,352 42,321
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 5,739 4,093
Securities, Available for sale Debt Securities, Gross Unrealized Gains 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (340) (285)
Debt Securities, Available-for-sale 5,399 3,809
Held-to-maturity securities, Amortized Cost 466 578
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (10) (14)
Debt Securities, Held-to-maturity, Fair Value 456 564
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,695 7,702
Securities, Available for sale Debt Securities, Gross Unrealized Gains 1 25
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (643) (479)
Debt Securities, Available-for-sale 7,053 7,248
Held-to-maturity securities, Amortized Cost 28 29
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5) (3)
Debt Securities, Held-to-maturity, Fair Value 23 26
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 23,511 23,675
Securities, Available for sale Debt Securities, Gross Unrealized Gains 5 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,857) (1,798)
Debt Securities, Available-for-sale 21,659 21,894
Held-to-maturity securities, Amortized Cost 188 89
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 188 89
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,632 7,379
Securities, Available for sale Debt Securities, Gross Unrealized Gains 0 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,158) (808)
Debt Securities, Available-for-sale 7,474 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,091 3,077
Securities, Available for sale Debt Securities, Gross Unrealized Gains 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (324) (294)
Debt Securities, Available-for-sale $ 2,767 $ 2,784