Schedule I (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Other investments		$ 5,527	$ 1,341
Cost or Amortized Cost	[1]	140,768
Fair Value		136,374
Amount at Which Shown in the Balance Sheet		136,367
All Related Party [Member]
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Other investments		368
Fixed maturities available for sale
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	[1]	110,972
Fair Value		106,571
Amount at Which Shown in the Balance Sheet		106,571
Fixed maturities available for sale | U.S. Treasury / Agency
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		3,721
Fair Value		3,590
Amount at Which Shown in the Balance Sheet		3,590
Fixed maturities available for sale | Non-U.S.
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		35,869
Fair Value		35,164
Amount at Which Shown in the Balance Sheet		35,164
Fixed maturities available for sale | Corporate securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		44,591
Fair Value		42,830
Amount at Which Shown in the Balance Sheet		42,830
Fixed maturities available for sale | Mortgage-backed securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		23,717
Fair Value		22,058
Amount at Which Shown in the Balance Sheet		22,058
Fixed maturities available for sale | States, municipalities, and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		3,074
Fair Value		2,929
Amount at Which Shown in the Balance Sheet		2,929
Industrial, miscellaneous, and all others
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		3,455
Fair Value		3,455
Amount at Which Shown in the Balance Sheet		3,455
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		4,551
Fair Value		4,551
Amount at Which Shown in the Balance Sheet		4,551
Other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost		5,527
Fair Value		5,527
Amount at Which Shown in the Balance Sheet		5,527
Private equities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	[2]	13,710
Fair Value	[2]	13,710
Amount at Which Shown in the Balance Sheet	[2]	13,710
Private debt held for investment
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost or Amortized Cost	[1]	2,553
Fair Value		2,560
Amount at Which Shown in the Balance Sheet		$ 2,553

[1] Net of valuation allowance for expected credit losses.

[2] Excludes $368 million of related party investments.