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Future Policy Benefits (Assumption Explanations) (Details) - Other Segments - USD ($) | Sep. 30, 2024 | Sep. 30, 2023
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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 | $ 12,500,000,000 | $ 12,000,000,000
Future Policy Benefits Actual To Expected Variance | (113,000,000) | (5,000,000)
Impact Of Updating Discount Rate Recognized In OCI | (7,000,000) | 1,000,000
Changes In Cash Flow Assumptions | 31,000,000 | 17,000,000
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 | 3,600,000,000 | 3,400,000,000
Future Policy Benefits Actual To Expected Variance | (6,000,000) | (5,000,000)
Impact Of Updating Discount Rate Recognized In OCI | (134,000,000) | 267,000,000
Changes In Cash Flow Assumptions | 28,000,000 | 12,000,000
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 | 1,500,000,000 | 1,300,000,000
Future Policy Benefits Actual To Expected Variance | 4,000,000 | 9,000,000
Impact Of Updating Discount Rate Recognized In OCI | 109,000,000 | 88,000,000
Changes In Cash Flow Assumptions | 25,000,000 | 47,000,000
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 | 4,900,000,000 | 4,500,000,000
Future Policy Benefits Actual To Expected Variance | 89,000,000 | (49,000,000)
Impact Of Updating Discount Rate Recognized In OCI | (171,000,000) | 233,000,000
Changes In Cash Flow Assumptions | 73,000,000 | 9,000,000
Insurance, Other | Americas [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 8,100,000,000 | 4,900,000,000
Future Policy Benefits Actual To Expected Variance | (3,000,000) | (8,000,000)
Impact Of Updating Discount Rate Recognized In OCI | (124,000,000) | (119,000,000)
Changes In Cash Flow Assumptions | 8,000,000 | 22,000,000
Insurance, Other | CANADA |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 4,100,000,000 | 26,000,000,000
Future Policy Benefits Actual To Expected Variance | 0 | (8,000,000)
Impact Of Updating Discount Rate Recognized In OCI | (168,000,000) | (1,000,000)
Changes In Cash Flow Assumptions | 0 | 22,000,000
Insurance, Other | EMEA [Member] |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |
Net Liability For Future Policy Benefits At Original Discount Rate | 7,000,000,000 | 5,900,000,000
Future Policy Benefits Actual To Expected Variance | 1,000,000 | 13,000,000,000
Impact Of Updating Discount Rate Recognized In OCI | 241,000,000 | 67,000,000
Changes In Cash Flow Assumptions | 3,000,000 | 34,000,000
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 | 12,700,000,000 | 5,700,000,000
Future Policy Benefits Actual To Expected Variance | 1,000,000 | 2,000,000
Impact Of Updating Discount Rate Recognized In OCI | (540,000,000) | (359,000,000)
Changes In Cash Flow Assumptions | $ 9,000,000 | $ 0

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