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Investments (Short-Term and Long-Term Investments) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 48,333 $ 45,926
Securities, Available for sale Debt Securities, Gross Unrealized Gains 165 59
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (3,117) (3,664)
Debt Securities, Available-for-sale 45,381 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 (13) (17)
Debt Securities, Held-to-maturity, Fair Value 669 679
Total debt securities, Amortized Cost 49,015 46,622
Total debt securities, Gross Unrealized Gains 165 59
Total debt securities, Gross Unrealized Losses (3,130) (3,681)
Debt securities, Fair Value Disclosure 46,050 43,000
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale 45,381 42,321
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 4,760 4,093
Securities, Available for sale Debt Securities, Gross Unrealized Gains 5 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (236) (285)
Debt Securities, Available-for-sale 4,529 3,809
Held-to-maturity securities, Amortized Cost 594 578
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 584 564
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,055 7,702
Securities, Available for sale Debt Securities, Gross Unrealized Gains 65 25
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (365) (479)
Debt Securities, Available-for-sale 7,755 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 24,149 23,675
Securities, Available for sale Debt Securities, Gross Unrealized Gains 59 17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,525) (1,798)
Debt Securities, Available-for-sale 22,683 21,894
Held-to-maturity securities, Amortized Cost 60 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 60 89
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,213 7,379
Securities, Available for sale Debt Securities, Gross Unrealized Gains 35 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (708) (808)
Debt Securities, Available-for-sale 7,540 6,586
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,156 3,077
Securities, Available for sale Debt Securities, Gross Unrealized Gains 1 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (283) (294)
Debt Securities, Available-for-sale $ 2,874 $ 2,784