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Insurance (Guarantees Related to Universal and Variable Life Contracts) (Details) - Universal and Variable Life Contracts - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Secondary Guarantees |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Total account value (1), (3) | $ 11,948 | $ 13,678
Net amount at risk (7) | $ 80,623 | $ 78,762
Average attained age of policyholders | 55 years | 55 years
Paid-Up Guarantees |  |
Net Amount at Risk by Product and Guarantee [Line Items] |  |
Total account value (1), (3) | $ 2,570 | $ 2,694
Net amount at risk (7) | $ 11,824 | $ 12,657
Average attained age of policyholders | 67 years | 66 years

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- Definition Net amount at risk, representing the guaranteed benefit in excess of the current account balance corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3),(5) -URI https://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124504833&loc=d3e7104-158389 + Details
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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(5)) -URI https://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI https://asc.fasb.org/extlink&oid=124504833&loc=d3e7104-158389 + Details
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