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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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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

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