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Reinsurance Reinsurance (Assumed Life Reinsurance Programs Involving Minimum Benefit Guarantees Under Annuity Contracts - Schedule Of Guaranteed Minimum Benefits Income And Expense) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Guaranteed Minimum Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 7,935 | $ 8,327 | $ 7,891 | $ 7,137 | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 31,290 | $ 30,064 | $ 29,034
Policy benefits and other reserve adjustments | $ 225 | $ 158 | $ 161 | $ 196 | $ 162 | $ 127 | $ 150 | $ 151 | 740 | 590 | 676
Guaranteed Minimum Death Benefit |  |  |  |  |  |  |  |  |  |  |
Guaranteed Minimum Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 41 | 47 | 49
Policy benefits and other reserve adjustments |  |  |  |  |  |  |  |  | 0 | 20 | 40
GLB |  |  |  |  |  |  |  |  |  |  |
Guaranteed Minimum Benefits [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned |  |  |  |  |  |  |  |  | 92 | 96 | 110
Policy benefits and other reserve adjustments |  |  |  |  |  |  |  |  | 122 | 110 | 105
Realized Investment Gains (Losses) |  |  |  |  |  |  |  |  | (6) | (250) | 363
Gain (loss) recognized in income |  |  |  |  |  |  |  |  | (36) | (264) | 368
Net cash received |  |  |  |  |  |  |  |  | 0 | 47 | 65
Net (increase) decrease in liability |  |  |  |  |  |  |  |  | $ (36) | $ (311) | $ 303

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- Definition Guaranteed Minimum Benefits net cash received (disbursed) + References No definition available. + Details
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- Definition Amount of increase (decrease) in the liability for guaranteed minimum benefits on long-duration contracts. + 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) -URI http://asc.fasb.org/extlink&oid=117420044&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 http://asc.fasb.org/extlink&oid=117418410&loc=d3e7104-158389 + Details
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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 Reference 3: 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(13)(c)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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