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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Americas [Member] | Life Insurance Product Line [Member]    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 88,432 $ 87,831
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 203,397 191,246
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 87,447 85,809
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 194,959 182,731
Americas [Member] | Insurance, Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 1,641 1,828
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 22,213 15,257
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 10,902 9,268
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 2,554 2,816
CANADA | Life Insurance Product Line [Member]    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 22,317 21,928
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 57,445 56,312
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 22,132 21,925
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 56,351 54,520
CANADA | Insurance, Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 3,733 4,101
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 17,625 17,933
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 7,996 8,029
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 5,676 6,306
EMEA [Member] | Life Insurance Product Line [Member]    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 16,513 15,609
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 30,886 28,796
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 16,284 15,219
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 30,092 28,668
EMEA [Member] | Insurance, Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 77,444 57,940
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 170,551 120,917
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 85,239 62,956
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 157,690 111,948
Asia Pacific [Member] | Life Insurance Product Line [Member]    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 46,387 42,453
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 109,528 99,908
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 39,452 36,218
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 113,661 103,658
Asia Pacific [Member] | Insurance, Other    
Liability for Future Policy Benefit, Activity [Line Items]    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 3,471 2,988
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 30,139 22,330
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance 14,068 12,831
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 5,235 $ 4,089