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Investments (Mortgage Loans Allowance for Credit Loss Rollforward by Portfolio Segment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | $ 634 | $ 590 | $ 353
Adoption of credit loss guidance | 0 | 0 | 78
Provision (release) | 43 | 67 | 176
Initial credit losses on PCD loans (1) | 0 | 3 | 18
Charge-offs, net of recoveries | (150) | (26) | (34)
HFS transfer | 0 | 0 | (1)
Balance at December 31, | 527 | 634 | 590
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 340 | 252 | 246
Adoption of credit loss guidance | 0 | 0 | (118)
Provision (release) | (2) | 88 | 124
Initial credit losses on PCD loans (1) | 0 | 0 | 0
Charge-offs, net of recoveries | (120) | 0 | 0
HFS transfer | 0 | 0 | 0
Balance at December 31, | 218 | 340 | 252
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 206 | 232 | 55
Adoption of credit loss guidance | 0 | 0 | 161
Provision (release) | (8) | (27) | 30
Initial credit losses on PCD loans (1) | 0 | 3 | 18
Charge-offs, net of recoveries | (8) | (2) | (32)
HFS transfer | 0 | 0 | 0
Balance at December 31, | 190 | 206 | 232
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance at January 1, | 88 | 106 | 52
Adoption of credit loss guidance | 0 | 0 | 35
Provision (release) | 53 | 6 | 22
Initial credit losses on PCD loans (1) | 0 | 0 | 0
Charge-offs, net of recoveries | (22) | (24) | (2)
HFS transfer | 0 | 0 | (1)
Balance at December 31, | $ 119 | $ 88 | $ 106

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- Definition Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (4) + Details
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