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Insurance (Insurance Liabilities Assumptions and Ratios - Narrative) (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Future Policy Benefits and Policyholder Contract Deposits, Assumptions [Abstract] |  |  |
Participating business as a percentage of gross life insurance policies in-force | 2.00% | 3.00% |
Participating business as a percentage of the gross life insurance premiums | 11.00% | 12.00% | 14.00%
Domestic Business | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate range credited to policyholder account balances | 1.00% |  |
Domestic Business | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate range credited to policyholder account balances | 8.00% |  |
Domestic Business | Participating Life Insurance Policies | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 3.00% |  |
Domestic Business | Participating Life Insurance Policies | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 7.00% |  |
Domestic Business | Nonparticipating Life Insurance Policies | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 2.00% |  |
Domestic Business | Nonparticipating Life Insurance Policies | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 11.00% |  |
Domestic Business | Individual and Group Traditional Fixed annuities [Member] | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
Domestic Business | Individual and Group Traditional Fixed annuities [Member] | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 11.00% |  |
Domestic Business | Non-medical Health Insurance [Member] | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
Domestic Business | Non-medical Health Insurance [Member] | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 7.00% |  |
Domestic Business | Group Long-Term Disability | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 2.00% |  |
Domestic Business | Group Long-Term Disability | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 8.00% |  |
International Business | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate range credited to policyholder account balances | 1.00% |  |
International Business | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate range credited to policyholder account balances | 12.00% |  |
International Business | Participating Life Insurance Policies | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
International Business | Participating Life Insurance Policies | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 10.00% |  |
International Business | Nonparticipating Life Insurance Policies | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
International Business | Nonparticipating Life Insurance Policies | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 10.00% |  |
International Business | Individual and Group Traditional Fixed annuities [Member] | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
International Business | Individual and Group Traditional Fixed annuities [Member] | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 9.00% |  |
International Business | Group Long-Term Disability | Minimum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 1.00% |  |
International Business | Group Long-Term Disability | Maximum |  |  |
Liability for Future Policy Benefit, by Product Segment [Line Items] |  |  |
Interest rate assumptions for the aggregate future policy benefit liabilities for traditional life insurance policies | 9.00% |  |

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