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Insurance Liabilities (Future Policy Benefits - Reconciliation) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance $ 32,245 $ 32,286
Liabilities reported in the preceding rollforward tables    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance 20,286 20,119
Long-term care insurance (1)    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance 5,375 5,763
ULSG liabilities, including liability for profits followed by losses    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance 2,591 2,654
Participating whole life insurance (2)    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance 3,128 2,986
Deferred profit liabilities    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance 480 373
Other    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Liability for Future Policy Benefit, before Reinsurance $ 385 $ 391