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Future Policy Benefits (Undiscounted and Discounted) (Details) - Other Segments - USD ($) $ in Millions | Mar. 31, 2023 | Mar. 31, 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 | $ 82,288 | $ 93,268
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 181,123 | 181,789
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 80,478 | 91,772
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 172,081 | 172,097
Americas [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 1,975 | 686
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 9,214 | 7,360
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 5,408 | 4,648
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 3,112 | 972
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 | 21,317 | 24,355
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 56,223 | 60,162
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 21,289 | 24,421
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 53,244 | 56,648
CANADA | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 3,149 | 3,843
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 4,602 | 5,387
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 3,062 | 3,760
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 4,738 | 5,506
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 | 13,611 | 16,254
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 24,150 | 24,939
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 12,889 | 15,377
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 24,591 | 25,517
EMEA [Member] | Insurance, Other |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance | 37,636 | 41,655
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 66,775 | 59,907
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 39,070 | 43,738
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 64,424 | 56,874
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 | 37,986 | 38,094
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 88,496 | 82,052
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 32,313 | 32,473
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | 92,305 | 84,355
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 | 2,478 | 2,840
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance | 10,144 | 9,175
Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance | 7,472 | 7,107
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance | $ 2,977 | $ 3,280

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