Investments (Details) - Contractual Maturities - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Fixed maturities, due in one year or less, amortized cost	$ 4,592
Fixed maturities, due after 1 year through 5 years, amortized cost	18,081
Fixed maturities, due after 5 years through 10 years, amortized cost	25,645
Fixed maturities, due after 10 years, amortized cost	24,679
Fixed maturities excluding mortgage-backed securities, collateralized mortgage obligations and pass-through securities, amortized cost	72,997
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities, amortized cost	1,754
Fixed maturities, amortized cost	74,751	$ 68,830
Fixed maturities, due in one year or less, fair value	4,635
Fixed maturities, due after 1 year through 5 years, fair value	18,833
Fixed maturities, due after 5 years through 10 years, fair value	26,401
Fixed maturities, due after 10 years, fair value	26,124
Fixed maturities excluding mortgage-backed securities, collateralized mortgage obligations and pass-through securities, fair value	75,993
Mortgage-backed securities, collateralized mortgage obligations and pass-through securities, fair value	1,817
Fixed maturities, at fair value	$ 77,810	$ 74,003