Investments (Details) - Contractual Maturities - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investments [Abstract]
Fixed maturities, due in one year or less, amortized cost	$ 4,973
Fixed maturities, due after 1 year through 5 years, amortized cost	20,438
Fixed maturities, due after 5 years through 10 years, amortized cost	24,982
Fixed maturities, due after 10 years, amortized cost	24,809
Fixed maturities excluding mortgage-backed securities, collateralized mortgage obligations and pass-through securities, amortized cost	75,202
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities, amortized cost	2,178
Fixed maturities, amortized cost	77,380	$ 74,751
Fixed maturities, due in one year or less, fair value	4,941
Fixed maturities, due after 1 year through 5 years, fair value	19,641
Fixed maturities, due after 5 years through 10 years, fair value	22,224
Fixed maturities, due after 10 years, fair value	22,363
Fixed maturities excluding mortgage-backed securities, collateralized mortgage obligations and pass-through securities, fair value	69,169
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities, fair value	1,991
Fixed maturities, at fair value	$ 71,160	$ 77,810