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Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
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 | $ 12,100 | $ 11,000
Future Policy Benefits Actual To Expected Variance | 31 | (24)
Impact Of Updating Discount Rate Recognized In OCI | $ 428 | $ 490
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.3% decrease | 0.2% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 3.5% decrease | 4.4% increase
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 | $ 3,500 | $ 3,400
Future Policy Benefits Actual To Expected Variance | 3 | (1)
Impact Of Updating Discount Rate Recognized In OCI | $ 239 | $ 143
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.1% decrease | None
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 6.7% decrease | 4.3% increase
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 | $ 1,400 | $ 1,200
Future Policy Benefits Actual To Expected Variance | (2) | (2)
Impact Of Updating Discount Rate Recognized In OCI | $ (33) | $ (2)
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.1% decrease | 0.2% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 2.3% decrease | 0.2% decrease
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 | $ 4,700 | $ 4,300
Future Policy Benefits Actual To Expected Variance | (1) | 7
Impact Of Updating Discount Rate Recognized In OCI | $ 57 | $ 46
Future Policy Benefits Actual To Expected Variance Increase Decrease | None | 0.2% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 1.2% decrease | 1.1% increase
Insurance, Other | Americas [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 7,400 | $ 4,200
Future Policy Benefits Actual To Expected Variance | (2) | 4
Impact Of Updating Discount Rate Recognized In OCI | $ 84 | $ (96)
Future Policy Benefits Actual To Expected Variance Increase Decrease | None | 0.1% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 1.6% decrease | 2.3% increase
Insurance, Other | CANADA |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 25,000 | $ 50,000
Future Policy Benefits Actual To Expected Variance | 0 | 4
Impact Of Updating Discount Rate Recognized In OCI | $ 2 | $ (3)
Future Policy Benefits Actual To Expected Variance Increase Decrease | None | 7.5% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 7.7% decrease | 5.7% increase
Insurance, Other | EMEA [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 6,300 | $ 5,600
Future Policy Benefits Actual To Expected Variance | 2 | (11)
Impact Of Updating Discount Rate Recognized In OCI | $ (154) | $ 46
Future Policy Benefits Actual To Expected Variance Increase Decrease | None | 0.2% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 2.5% decrease | 0.8% increase
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 | $ 10,500 | $ 6,100
Future Policy Benefits Actual To Expected Variance | 0 | (1)
Impact Of Updating Discount Rate Recognized In OCI | $ (97) | $ (136)
Future Policy Benefits Actual To Expected Variance Increase Decrease | None | None
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 1.6% increase | 2.7% increase

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