Investments (Maturities of Fixed Maturity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized cost, due in one year or less	$ 3,724
Amortized cost, due after one year through five years	18,490
Amortized cost, due after five years through ten years	13,953
Amortized cost, due after ten years	29,118
Amortized cost, Structured Securities	21,992
Fixed maturity securities, amortized cost	87,277	$ 86,129
Estimated fair value, due in one year or less	3,682
Estimated fair value, due after one year through five years	17,859
Estimated fair value, due after five years through ten years	12,589
Estimated fair value, due after ten years	25,160
Estimated fair value, Structured Securities	20,508
Fixed maturity securities, estimated fair value	$ 79,798	$ 80,085