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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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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 | $ 77,008 | $ 77,507
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 188,177 | 179,693
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 75,158 | 75,916
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 177,307 | 169,526
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,794 | 581
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 10,233 | 7,041
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 5,600 | 3,873
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 3,012 | 940
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 | 19,902 | 19,543
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 56,423 | 54,039
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 19,933 | 19,668
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 54,378 | 50,727
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 2,856 | 3,102
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 4,285 | 4,697
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 2,706 | 3,033
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 4,545 | 4,803
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 | 13,131 | 11,267
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 24,509 | 21,758
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 12,558 | 10,643
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 24,778 | 22,139
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 36,603 | 28,141
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 71,027 | 51,232
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 37,931 | 29,346
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 68,410 | 48,987
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 | 35,372 | 33,712
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 87,120 | 82,458
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 30,132 | 28,626
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 90,652 | 85,465
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 | 2,828 | 2,278
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 10,522 | 7,765
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 6,611 | 5,688
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 3,797 | $ 2,718

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