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Fair Value - Reconciliations of Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Corporate Bonds and Other [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ 253 | $ 100 | $ 222 | $ 98
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) |  |  |  | (1)
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI | 12 | (1) | 20 | (1)
Purchases | 76 | 2 | 132 | 2
Sales |  | (5) |  | (5)
Settlements | (2) | (2) | (4) | (4)
Transfers into Level 3 |  |  |  | 5
Transfers out of Level 3 | (1) |  | (32) |
Ending balance | 338 | 94 | 338 | 94
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities | 10 |  | 17 |
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance |  | 1 |  | 1
Ending balance |  | 1 |  | 1
Total Asset-Backed [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 184 | 279 | 197 | 335
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) |  |  |  | 7
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI | 4 | (1) | 7 | (6)
Purchases |  | 41 | 20 | 71
Sales |  |  |  | (72)
Settlements | (4) | (6) | (8) | (12)
Transfers into Level 3 | 40 | 13 | 45 | 13
Transfers out of Level 3 | (31) | (53) | (68) | (63)
Ending balance | 193 | 273 | 193 | 273
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities | 5 |  | 8 |
Total Fixed Maturities Available-for-Sale [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 437 | 380 | 419 | 434
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) |  | 0 |  | 6
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI | 16 | (2) | 27 | (7)
Purchases | 76 | 43 | 152 | 73
Sales |  | (5) |  | (77)
Settlements | (6) | (8) | (12) | (16)
Transfers into Level 3 | 40 | 13 | 45 | 18
Transfers out of Level 3 | (32) | (53) | (100) | (63)
Ending balance | 531 | 368 | 531 | 368
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities |  | 0 |  | 0
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities | 15 |  | 25 |
Fixed Maturities Trading [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 5 | 7 | 6 | 4
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) | (1) |  | (2) | 3
Ending balance | 4 | 7 | 4 | 7
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities | (1) |  | (2) | 3
Fixed Maturity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 442 | 387 | 425 | 438
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) | (1) | 0 | (2) | 9
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in OCI | 16 | (2) | 27 | (7)
Purchases | 76 | 43 | 152 | 73
Sales |  | (5) |  | (77)
Settlements | (6) | (8) | (12) | (16)
Transfers into Level 3 | 40 | 13 | 45 | 18
Transfers out of Level 3 | (32) | (53) | (100) | (63)
Ending balance | 535 | 375 | 535 | 375
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities | (1) | 0 | (2) | 3
Unrealized Gains (Losses) Recognized in other Comprehensive Income (Loss) on Level 3 Assets and Liabilities | 15 |  | 25 |
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 21 | 20 | 19 | 22
Net Realized Investment Gains (Losses) and Net Change in Unrealized Investment Gains (Losses), Included in Net Income (Loss) |  | (1) | 2 | (3)
Purchases | 2 |  | 2 |
Sales |  | (1) |  | (1)
Ending balance | $ 23 | 18 | 23 | 18
Unrealized Gains (Losses) Recognized in Net Income (Loss) on Level 3 Assets and Liabilities |  | $ (1) | $ 3 | $ (3)

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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