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Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
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Life Insurance Product Line [Member] | Americas [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 14,700 | $ 12,100
Future Policy Benefits Actual To Expected Variance | (49,000) | (31,000)
Impact Of Updating Discount Rate Recognized In OCI | (70,000) | 428,000
Life Insurance Product Line [Member] | CANADA |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 3,400 | 3,500
Future Policy Benefits Actual To Expected Variance | 0 | (3,000)
Impact Of Updating Discount Rate Recognized In OCI | (27,000) | 239,000
Life Insurance Product Line [Member] | EMEA [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 1,600 | 1,400
Future Policy Benefits Actual To Expected Variance | 9,000 | 2,000
Impact Of Updating Discount Rate Recognized In OCI | 48,000 | 33,000
Life Insurance Product Line [Member] | Asia Pacific [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 5,000 | 4,700
Future Policy Benefits Actual To Expected Variance | 16,000 | (1,000)
Impact Of Updating Discount Rate Recognized In OCI | (50,000) | 57,000
Insurance, Other | Americas [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 10,200 | 7,400
Future Policy Benefits Actual To Expected Variance | (1) | (2)
Impact Of Updating Discount Rate Recognized In OCI | (93) | (84)
Insurance, Other | CANADA |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 4,400 | 25,000
Future Policy Benefits Actual To Expected Variance | 0 | 0
Impact Of Updating Discount Rate Recognized In OCI | (49) | (2)
Insurance, Other | EMEA [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 7,100 | 6,300
Future Policy Benefits Actual To Expected Variance | 3 | 2
Impact Of Updating Discount Rate Recognized In OCI | 127 | 154
Insurance, Other | Asia Pacific [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 14,400 | 10,500
Future Policy Benefits Actual To Expected Variance | 3 | 0
Impact Of Updating Discount Rate Recognized In OCI | $ (365) | $ (97)

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