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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 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 | $ 84,218 | $ 82,691
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 196,448 | 189,341
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 83,212 | 81,087
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 183,915 | 179,131
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,666 | 1,829
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 22,679 | 14,071
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 10,940 | 8,296
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 2,648 | 2,914
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 | 21,326 | 21,591
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 53,586 | 56,998
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 21,304 | 21,670
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 52,094 | 55,118
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 3,768 | 2,900
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 17,252 | 4,128
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 7,993 | 2,738
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 5,689 | 4,390
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 | 15,240 | 14,388
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 28,718 | 25,709
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 14,829 | 13,774
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 28,701 | 25,928
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 65,091 | 55,187
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 139,460 | 100,423
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 70,120 | 56,214
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 129,865 | 98,292
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 | 42,040 | 38,412
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 101,929 | 90,670
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 35,804 | 32,824
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 104,940 | 94,316
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 | 3,707 | 2,840
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 27,778 | 17,399
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 14,570 | 11,499
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 5,292 | $ 3,743

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