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Investments - Schedule of Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value for Fixed Income Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net $ 53,788 $ 49,649
Gross unrealized gains 292 650
Gross unrealized losses (1,504) (1,434)
Fair value 52,576 48,865
U.S. government and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 10,724 8,624
Gross unrealized gains 34 114
Gross unrealized losses (194) (119)
Fair value 10,564 8,619
Municipal    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 6,661 6,049
Gross unrealized gains 46 109
Gross unrealized losses (169) (152)
Fair value 6,538 6,006
Corporate    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 33,443 31,951
Gross unrealized gains 191 397
Gross unrealized losses (1,120) (1,143)
Fair value 32,514 31,205
Foreign government    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 1,299 1,286
Gross unrealized gains 5 17
Gross unrealized losses (15) (13)
Fair value 1,289 1,290
ABS    
Debt Securities, Available-for-Sale [Line Items]    
Amortized cost, net 1,661 1,739
Gross unrealized gains 16 13
Gross unrealized losses (6) (7)
Fair value $ 1,671 $ 1,745