Schedule I (Details) $ in Millions	Dec. 31, 2023 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	$ 64,998
Amount at Which Shown on Balance Sheet	60,855
Total debt securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	47,065
Fair Value	42,643
Amount at Which Shown on Balance Sheet	42,643
U.S. government securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	5,154
Fair Value	4,312
Amount at Which Shown on Balance Sheet	4,312
Other government securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	1,622
Fair Value	1,402
Amount at Which Shown on Balance Sheet	1,402
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	5,598
Fair Value	5,127
Amount at Which Shown on Balance Sheet	5,127
Corporate securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	27,870
Fair Value	25,477
Amount at Which Shown on Balance Sheet	25,477
Residential mortgage-backed
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	422
Fair Value	375
Amount at Which Shown on Balance Sheet	375
Commercial mortgage-backed
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	1,569
Fair Value	1,423
Amount at Which Shown on Balance Sheet	1,423
Other asset-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	4,830
Fair Value	4,527
Amount at Which Shown on Balance Sheet	4,527
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	394
Fair Value	394
Amount at Which Shown on Balance Sheet	394
Mortgage loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	10,563
Amount at Which Shown on Balance Sheet	10,563
Policy loans
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	4,399
Amount at Which Shown on Balance Sheet	4,399
Derivative instruments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	390
Amount at Which Shown on Balance Sheet	390
Other invested assets
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	2,187
Amount at Which Shown on Balance Sheet	$ 2,466