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Investments - Amortized Cost and Fair Value of Fixed Maturity Available-for-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Amortized Cost    
Amortized Cost $ 42,312 $ 37,708
Fair Value    
Total fixed maturity available-for-sale securities, Fair Value 38,029 33,095
Other securities, which provide for periodic payments:    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 19,993 17,210
Fair Value    
Other securities which provide for periodic payments, Fair Value 18,872 16,083
Corporates, Non-structured Hybrids, Municipal and Government securities:    
Amortized Cost    
Due in one year or less 594 536
Due after one year through five years 4,202 3,288
Due after five years through ten years 2,394 2,171
Due after ten years 15,129 14,503
Subtotal, Amortized Cost 22,319 20,498
Fair Value    
Due in one year or less 581 527
Due after one year through five years 4,001 3,089
Due after five years through ten years 2,172 1,939
Due after ten years 12,403 11,457
Subtotal, Fair Value 19,157 17,012
Asset-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 13,492 12,209
Amortized Cost 13,492 12,209
Fair Value    
Other securities which provide for periodic payments, Fair Value 12,840 11,467
Total fixed maturity available-for-sale securities, Fair Value 12,840 11,467
Commercial mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 4,348 3,337
Amortized Cost 4,348 3,337
Fair Value    
Other securities which provide for periodic payments, Fair Value 3,989 3,063
Total fixed maturity available-for-sale securities, Fair Value 3,989 3,063
Structured hybrids    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 26 26
Fair Value    
Other securities which provide for periodic payments, Fair Value 27 26
Residential mortgage-backed securities    
Amortized Cost    
Other securities which provide for periodic payments, Amortized Cost 2,127 1,638
Fair Value    
Other securities which provide for periodic payments, Fair Value $ 2,016 $ 1,527