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Investments - (Summary of Allowance for Credit Losses on HTM Investments) (Detail) - Variable Interest Entity Primary Beneficiary [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Ending balance | $ 0 | $ 0
Accounting Standards Update 2016-13 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 23 | 37
Current period provision for expected credit losses | (23) | (37)
Initial allowance recognized for PCD assets | 0 | 0
Write- Offs | 0 | 0
Recoveries | 0 | 0
Ending balance | 0 | 0
Corporate Obligations [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Ending balance | 0 | 0
Corporate Obligations [Member] | Accounting Standards Update 2016-13 [Member] |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items] |  |
Beginning balance | 23 | 37
Current period provision for expected credit losses | (23) | (37)
Initial allowance recognized for PCD assets | 0 | 0
Write- Offs | 0 | 0
Recoveries | 0 | 0
Ending balance | $ 0 | $ 0

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + 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 (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of increase in allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity) and beneficial interest, purchased with credit deterioration. + 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 (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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