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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 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 | $ 82,691 | $ 82,288
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 189,341 | 181,123
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 81,087 | 80,478
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 179,131 | 172,081
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,829 | 1,975
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 14,071 | 9,214
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 8,296 | 5,408
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 2,914 | 3,112
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 | 21,591 | 21,317
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 56,998 | 56,223
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 21,670 | 21,289
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 55,118 | 53,244
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 2,900 | 3,149
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 4,128 | 4,602
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 2,738 | 3,062
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 4,390 | 4,738
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 | 14,388 | 13,611
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 25,709 | 24,150
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 13,774 | 12,889
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 25,928 | 24,591
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 55,187 | 37,636
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 100,423 | 66,775
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 56,214 | 39,070
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 98,292 | 64,424
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 | 38,412 | 37,986
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 90,670 | 88,496
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 32,824 | 32,313
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 94,316 | 92,305
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 | 2,840 | 2,478
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 17,399 | 10,144
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 11,499 | 7,472
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 3,743 | $ 2,977

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