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Investments (Fair Value of Available-For-Sale Investments with Gross Unrealized Losses by Investment Type and Length of Time That Individual Securities Have Been in a Continuous Unrealized Loss Position) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Securities - available-for-sale    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value $ 16,677 $ 5,619
Less Than 12 Months, Gross Unrealized Losses (518) (49)
Greater Than 12 Months, Fair Value 24,223 28,107
Greater Than 12 Months, Gross Unrealized Losses (2,440) (2,641)
Total, Fair Value 40,900 33,726
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,958) (2,690)
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 1,475 1,270
Less Than 12 Months, Gross Unrealized Losses (51) (7)
Greater Than 12 Months, Fair Value 2,152 2,077
Greater Than 12 Months, Gross Unrealized Losses (223) (227)
Total, Fair Value 3,627 3,347
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (274) (234)
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 2,593 907
Less Than 12 Months, Gross Unrealized Losses (58) (7)
Greater Than 12 Months, Fair Value 4,085 4,063
Greater Than 12 Months, Gross Unrealized Losses (317) (315)
Total, Fair Value 6,678 4,970
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (375) (322)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 7,402 1,826
Less Than 12 Months, Gross Unrealized Losses (213) (17)
Greater Than 12 Months, Fair Value 11,449 14,696
Greater Than 12 Months, Gross Unrealized Losses (927) (1,169)
Total, Fair Value 18,851 16,522
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,140) (1,186)
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 4,791 1,337
Less Than 12 Months, Gross Unrealized Losses (191) (12)
Greater Than 12 Months, Fair Value 4,674 5,069
Greater Than 12 Months, Gross Unrealized Losses (803) (696)
Total, Fair Value 9,465 6,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (994) (708)
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 416 279
Less Than 12 Months, Gross Unrealized Losses (5) (6)
Greater Than 12 Months, Fair Value 1,863 2,202
Greater Than 12 Months, Gross Unrealized Losses (170) (234)
Total, Fair Value 2,279 2,481
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (175) $ (240)