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Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
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)