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Significant Accounting Policies - Changes in Balances of Long-duration Insurance Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Large Case Pensions
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance	$ 2,139	$ 2,253		$ 3,647
Add: Reinsurance recoverable	0	0		0
Effect of changes in cash flow assumptions		0	$ 0
Liability for future policy benefits, end of period - current discount rate	2,139	2,253	3,034	3,647
Large Case Pensions | As Reported
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance				3,224
Add: Reinsurance recoverable				0
Liability for future policy benefits, beginning of period - current discount rate				3,224
Large Case Pensions | Change in discount rate assumptions
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				604
Large Case Pensions | Removal of shadow adjustments in accumulated other comprehensive income
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				(181)
Long-Term Care
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance	1,347	1,266		1,695
Add: Reinsurance recoverable	0	0		0
Effect of changes in cash flow assumptions		0	99
Liability for future policy benefits, end of period - current discount rate	$ 1,640	$ 1,566	$ 1,991	1,695
Long-Term Care | As Reported
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance				1,142
Add: Reinsurance recoverable				0
Liability for future policy benefits, beginning of period - current discount rate				1,142
Long-Term Care | Change in discount rate assumptions
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				553
Long-Term Care | Removal of shadow adjustments in accumulated other comprehensive income
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				0
Other
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance				490
Add: Reinsurance recoverable				308
Liability for future policy benefits, end of period - current discount rate				798
Other | As Reported
Present value of expected future policy benefits
Balance at December 31, 2020, net of reinsurance				480
Add: Reinsurance recoverable				274
Liability for future policy benefits, beginning of period - current discount rate				754
Other | Change in discount rate assumptions
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				44
Other | Removal of shadow adjustments in accumulated other comprehensive income
Present value of expected future policy benefits
Effect of changes in cash flow assumptions				$ 0

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Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows.

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Amount, after allowance for credit loss, recoverable under reinsurance of liability for future policy benefit.

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