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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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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 | $ 87,831 | $ 77,008
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 191,246 | 188,177
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 85,809 | 75,158
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 182,731 | 177,307
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,828 | 1,794
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 15,257 | 10,233
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 9,268 | 5,600
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 2,816 | 3,012
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 | 21,928 | 19,902
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 56,312 | 56,423
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 21,925 | 19,933
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 54,520 | 54,378
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 4,101 | 2,856
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 17,933 | 4,285
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 8,029 | 2,706
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 6,306 | 4,545
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 | 15,609 | 13,131
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 28,796 | 24,509
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 15,219 | 12,558
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 28,668 | 24,778
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 57,940 | 36,603
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 120,917 | 71,027
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 62,956 | 37,931
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 111,948 | 68,410
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 | 42,453 | 35,372
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 99,908 | 87,120
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 36,218 | 30,132
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 103,658 | 90,652
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 | 2,988 | 2,828
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 22,330 | 10,522
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 12,831 | 6,611
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 4,089 | $ 3,797

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