Schedule I. Summary of Investments (Details) $ in Millions	Dec. 31, 2021 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 29,850
Fair Value	32,350
Amount Shown on Consolidated Balance Sheets	32,218
U.S. Treasuries
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	554
Fair Value	691
Amount Shown on Consolidated Balance Sheets	691
U.S. Government agencies and authorities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	20
Fair Value	20
Amount Shown on Consolidated Balance Sheets	20
State, municipalities and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	716
Fair Value	803
Amount Shown on Consolidated Balance Sheets	803
U.S. corporate public securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	7,314
Fair Value	8,269
Amount Shown on Consolidated Balance Sheets	8,269
U.S. corporate private securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,620
Fair Value	3,939
Amount Shown on Consolidated Balance Sheets	3,939
Foreign corporate public securities and foreign governments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,352
Fair Value	2,591
Amount Shown on Consolidated Balance Sheets	2,591
Foreign corporate private securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,563
Fair Value	2,703
Amount Shown on Consolidated Balance Sheets	2,703
Residential mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,081
Fair Value	3,164
Amount Shown on Consolidated Balance Sheets	3,164
Commercial mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,766
Fair Value	2,881
Amount Shown on Consolidated Balance Sheets	2,881
Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	1,341
Fair Value	1,351
Amount Shown on Consolidated Balance Sheets	1,351
Embedded derivatives - fixed maturities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	24,327
Fair Value	26,412
Amount Shown on Consolidated Balance Sheets	26,412
Equity Securities [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	0
Fair Value	0
Amount Shown on Consolidated Balance Sheets	141
Mortgage loans on real estate
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	4,233
Fair Value	4,495
Amount Shown on Consolidated Balance Sheets	4,222
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	171
Fair Value	171
Amount Shown on Consolidated Balance Sheets	171
Limited partnerships/corporations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	980
Fair Value	980
Amount Shown on Consolidated Balance Sheets	980
Derivatives
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	(4)
Fair Value	149
Amount Shown on Consolidated Balance Sheets	149
Other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	143
Fair Value	143
Amount Shown on Consolidated Balance Sheets	$ 143