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Investments (Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 47,558 $ 45,926
Securities, Available for sale Debt Securities, Gross Unrealized Gains 26 59
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (3,456) (3,664)
Debt Securities, Available-for-sale 44,128 42,321
Held-to-maturity securities, Amortized Cost 740 696
Securities, Held to maturity, Unrecognized Holding Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14) (17)
Debt Securities, Held-to-maturity, Fair Value 726 679
Total debt securities, Amortized Cost 48,298 46,622
Total debt securities, Gross Unrealized Gains 26 59
Total debt securities, Gross Unrealized Losses (3,470) (3,681)
Debt securities, Fair Value Disclosure 44,854 43,000
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale 44,128 42,321
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 4,990 4,093
Securities, Available for sale Debt Securities, Gross Unrealized Gains 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (283) (285)
Debt Securities, Available-for-sale 4,707 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 (11) (14)
Debt Securities, Held-to-maturity, Fair Value 455 564
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 7,334 7,702
Securities, Available for sale Debt Securities, Gross Unrealized Gains 10 25
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (427) (479)
Debt Securities, Available-for-sale 6,917 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 (3) (3)
Debt Securities, Held-to-maturity, Fair Value 25 26
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 23,582 23,675
Securities, Available for sale Debt Securities, Gross Unrealized Gains 11 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,643) (1,798)
Debt Securities, Available-for-sale 21,950 21,894
Held-to-maturity securities, Amortized Cost 246 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 246 89
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,504 7,379
Securities, Available for sale Debt Securities, Gross Unrealized Gains 5 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (799) (808)
Debt Securities, Available-for-sale 7,710 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,148 3,077
Securities, Available for sale Debt Securities, Gross Unrealized Gains 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (304) (294)
Debt Securities, Available-for-sale $ 2,844 $ 2,784