Insurance (Future Policy Benefits - Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 31,970	$ 36,066
Liabilities reported in the preceding rollforward tables
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	20,048	22,507
Long-term care insurance (1)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	5,763	6,708
ULSG liability for profits followed by losses
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	2,654	3,461
Participating whole life insurance (2)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 2,729	$ 2,525
Participating Insurance, Percentage of Gross Insurance in Force	4.00%	4.00%
Participating Insurance, Percentage of Premium Income	42.00%	36.00%
Participating whole life insurance (2) | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefits, Interest Rate Assumption	3.5
Participating whole life insurance (2) | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefits, Interest Rate Assumption	4.0
Deferred profit liabilities
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 369	$ 375
Other
Liability for Future Policy Benefit, by Product Segment [Line Items]
Liability for Future Policy Benefit, before Reinsurance	$ 407	$ 490