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Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Life Insurance Product Line [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Changes In Cash Flow Assumptions | $ 85,000,000 | $ 269,000,000
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 | 12,000,000,000 | 11,000,000,000
Future Policy Benefits Actual To Expected Variance | (5,000,000) | (92,000,000)
Impact Of Updating Discount Rate Recognized In OCI | $ 1,000,000 | $ (5,200,000)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 7.2% increase | 3.3% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease | — | 0.9% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 9.2% decrease | 49 % decrease
Changes In Cash Flow Assumptions | $ 17,000,000 | $ 130,000,000
Change In Cash Flow Assumptions Increase Decrease | 0.2% increase | 1.2% 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 | $ 3,400,000,000 | $ 3,200,000,000
Future Policy Benefits Actual To Expected Variance | (5,000,000) | (27,000,000)
Impact Of Updating Discount Rate Recognized In OCI | $ 267,000,000 | $ (1,500,000)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 3.5% increase | 6.2% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.2% increase | 0.8% increase
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 8.0% decrease | 43.9% decrease
Changes In Cash Flow Assumptions | $ 12,000,000 | $ 6,000,000
Change In Cash Flow Assumptions Increase Decrease | 0.4% increase | 0.2% 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 | $ 1,300,000,000 | $ 1,100,000,000
Future Policy Benefits Actual To Expected Variance | 9,000,000 | (11,000,000)
Impact Of Updating Discount Rate Recognized In OCI | $ (88,000,000) | $ (345,000,000)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 9.8% increase | 10.2% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.7% increase | 0.9% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 7.3% decrease | 28.2% decrease
Changes In Cash Flow Assumptions | $ 47,000,000 | $ 13,000,000
Change In Cash Flow Assumptions Increase Decrease | 3.9% increase | 1.1% increase
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 | $ 4,500,000,000 | $ 4,100,000,000
Future Policy Benefits Actual To Expected Variance | (49,000,000) | 27,000,000
Impact Of Updating Discount Rate Recognized In OCI | $ 233,000,000 | $ (903,000,000)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 5.5% increase | 1.9% increase
Future Policy Benefits Actual To Expected Variance Increase Decrease | 1.1% decrease | 0.7% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 5.4% decrease | 22.4% decrease
Changes In Cash Flow Assumptions | $ 9,000,000 | $ 120,000,000
Change In Cash Flow Assumptions Increase Decrease | 0.2% increase | 3% increase
Insurance, Other |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Changes In Cash Flow Assumptions | $ 78,000,000 | $ 3,000,000
Insurance, Other | Americas [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 4,900,000,000 | 4,200,000,000
Future Policy Benefits Actual To Expected Variance | 8,000,000 | 23,000,000
Impact Of Updating Discount Rate Recognized In OCI | $ 119,000,000 | $ 928,000,000
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 18.2% increase | 4.4% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.2% decrease | 0.5% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 2.9% decrease | 21.1% decrease
Changes In Cash Flow Assumptions | $ (22,000,000) | $ (3,000,000)
Change In Cash Flow Assumptions Increase Decrease | 0.5% decrease | 0.1% decrease
Insurance, Other | CANADA |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 26,000,000,000 | $ 53,000,000,000
Future Policy Benefits Actual To Expected Variance | 8,000,000 | 9,000,000
Impact Of Updating Discount Rate Recognized In OCI | $ (1,000,000) | $ 15,000,000
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 50.9% decrease | 17.2% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | 15.1% decrease | 14.1% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 1.9% increase | 23.4% decrease
Changes In Cash Flow Assumptions | $ (22,000,000) | $ 0
Change In Cash Flow Assumptions Increase Decrease | 41.5% decrease | —
Insurance, Other | EMEA [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | $ 5,900,000,000 | $ 5,000,000,000
Future Policy Benefits Actual To Expected Variance | (13,000,000) | (9,000,000,000)
Impact Of Updating Discount Rate Recognized In OCI | $ (67,000,000) | $ (1,600,000)
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 7.2% increase | 19.6% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | 0.2% decrease | 0.1% decrease
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 1.2% decrease | 29.2% decrease
Changes In Cash Flow Assumptions | $ (34,000,000) | $ 0
Change In Cash Flow Assumptions Increase Decrease | 0.6% decrease | —
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 | $ 5,700,000,000 | $ 4,500,000,000
Future Policy Benefits Actual To Expected Variance | (2,000,000) | 1,000,000
Impact Of Updating Discount Rate Recognized In OCI | $ 359,000,000 | $ 311,000,000
Net Liability For Future Policy Benefits At Original Discount Rate Increase Decrease | 14.4% increase | 10.4% decrease
Future Policy Benefits Actual To Expected Variance Increase Decrease | — | —
Impact Of Updating Discount Rate Recognized In OCI Increase Decrease | 7.2% decrease | 6.5% decrease
Changes In Cash Flow Assumptions | $ 0 | $ 0
Change In Cash Flow Assumptions Increase Decrease | — | —

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