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Investments - Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | $ 32 | $ 36 | $ 31 | $ 39
Provision for loan losses | 3 | (2) | 4 | (5)
Ending Balance | 35 | 34 | 35 | 34
Residential Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 26 | 31 | 25 | 37
Provision for loan losses | 3 | (3) | 4 | (9)
Ending Balance | 29 | 28 | 29 | 28
Commercial Mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning Balance | 6 | 5 | 6 | 2
Provision for loan losses | 0 | 1 | 0 | 4
Ending Balance | $ 6 | $ 6 | $ 6 | $ 6

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Details
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- Details
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