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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, 2023
Dec. 31, 2022
Debt Securities - available-for-sale    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value $ 5,619 $ 24,899
Less Than 12 Months, Gross Unrealized Losses (49) (1,750)
Greater Than 12 Months, Fair Value 28,107 12,320
Greater Than 12 Months, Gross Unrealized Losses (2,641) (1,914)
Total, Fair Value 33,726 37,219
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (2,690) (3,664)
U.S. Government and Agency Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 1,270 2,007
Less Than 12 Months, Gross Unrealized Losses (7) (96)
Greater Than 12 Months, Fair Value 2,077 1,290
Greater Than 12 Months, Gross Unrealized Losses (227) (189)
Total, Fair Value 3,347 3,297
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (234) (285)
State and Municipal Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 907 4,630
Less Than 12 Months, Gross Unrealized Losses (7) (288)
Greater Than 12 Months, Fair Value 4,063 1,178
Greater Than 12 Months, Gross Unrealized Losses (315) (191)
Total, Fair Value 4,970 5,808
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (322) (479)
Corporate Obligations [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 1,826 13,003
Less Than 12 Months, Gross Unrealized Losses (17) (893)
Greater Than 12 Months, Fair Value 14,696 6,637
Greater Than 12 Months, Gross Unrealized Losses (1,169) (905)
Total, Fair Value 16,522 19,640
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (1,186) (1,798)
U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 1,337 3,561
Less Than 12 Months, Gross Unrealized Losses (12) (345)
Greater Than 12 Months, Fair Value 5,069 2,239
Greater Than 12 Months, Gross Unrealized Losses (696) (463)
Total, Fair Value 6,406 5,800
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (708) (808)
Non-U.S. Agency Mortgage-Backed Securities [Member]    
Schedule of Investments [Line Items]    
Less Than 12 Months, Fair Value 279 1,698
Less Than 12 Months, Gross Unrealized Losses (6) (128)
Greater Than 12 Months, Fair Value 2,202 976
Greater Than 12 Months, Gross Unrealized Losses (234) (166)
Total, Fair Value 2,481 2,674
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (240) $ (294)