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Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |
Level 3 | Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | $ 465 |  | $ 360 |  | 449 |  | 345 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 0 |  | 0 |  | 3 |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | (13) |  |  |  | (16) |  | (15) |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (6) |  | 0 |  | (20) |  | 6 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (1) |  | 0 |  | (3) |  | (1) |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 67 |  | 43 |  | 149 |  | 96 |  |  |  |  |  |  |  |  |
Sales, Assets |  | (16) |  | (14) |  | (62) |  | (19) |  |  |  |  |  |  |  |  |
Settlements, Assets |  | (27) |  | (18) |  | (28) |  | (44) |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 469 |  | 371 |  | 469 |  | 371 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Level 3 | Corporate and asset-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 1,502 |  | 1,342 |  | 1,451 |  | 1,299 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 10 |  | 91 |  | 15 |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | (71) |  |  |  | (72) |  | 0 |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 1 |  | 1 |  | (44) |  | 5 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (13) |  | (1) |  | (26) |  | 0 |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 83 |  | 121 |  | 222 |  | 249 |  |  |  |  |  |  |  |  |
Sales, Assets |  | (48) |  | (36) |  | (67) |  | (73) |  |  |  |  |  |  |  |  |
Settlements, Assets |  | (85) |  | (78) |  | (186) |  | (136) |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 1,369 |  | 1,359 |  | 1,369 |  | 1,359 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 5 |  | (1) |  | (9) |  | (1) |  |  |  |  |  |  |  |  |
Level 3 | Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 60 |  | 78 |  | 60 |  | 61 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 0 |  | 0 |  | 0 |  | 18 |  |  |  |  |  |  |  |  |
Sales, Assets |  | 0 |  | (1) |  | 0 |  | (1) |  |  |  |  |  |  |  |  |
Settlements, Assets |  | 0 |  | (1) |  | 0 |  | (2) |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 60 |  | 76 |  | 60 |  | 76 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Level 3 | Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 67 |  | 55 |  | 69 |  | 57 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (1) |  | 1 |  | 0 |  | 2 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (1) |  | (1) |  | (3) |  | (3) |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 8 |  | 5 |  | 11 |  | 14 |  |  |  |  |  |  |  |  |
Sales, Assets |  | (9) |  | (4) |  | (13) |  | (14) |  |  |  |  |  |  |  |  |
Settlements, Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 64 |  | 56 |  | 64 |  | 56 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 1 |  | (1) |  | (1) |  | (2) |  |  |  |  |  |  |  |  |
Level 3 | Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 1 |  | 0 |  | 6 |  | 1 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 1 |  | 4 |  | 2 |  | 4 |  |  |  |  |  |  |  |  |
Sales, Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Settlements, Assets |  | 0 |  | 0 |  | (6) |  | (1) |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 2 |  | 4 |  | 2 |  | 4 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Level 3 | Other Long-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 10 |  | 11 |  | 10 |  | 11 |  |  |  |  |  |  |  |  |
Transfers Into Level 3, Asset |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  |  |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Purchases, Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Sales, Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Settlements, Assets |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Balance-End of Period, Assets |  | 10 |  | 11 |  | 10 |  | 11 |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Available-for-sale Securities [Member] | Level 3 | Non-U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | (5) |  |  |  | (20) |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities [Member] | Level 3 | Corporate and asset-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 7 |  |  |  | (37) |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities [Member] | Level 3 | Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  | 928 |  | 403 |  | 928 |  | 403 |  | $ 1,141 |  | $ 456 |  | $ 338 |  | $ 452 |
Guaranteed Minimum Income Benefit [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Guaranteed Minimum Income Benefit [Member] | Fair Value, Recurring [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | [1] | 928 |  |  |  | 928 |  |  |  |  |  | 456 | [2] |  |  |  |
Guaranteed Minimum Income Benefit [Member] | Guarantees [Member] | Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value |  | 928 | [3],[4] | 403 | [4] | 928 | [3],[4] | 403 | [4] | $ 1,141 | [3] | $ 456 |  | $ 338 | [4] | $ 452 | [4]
Transfers into level 3, liability |  |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (213) | [3] | 65 | [4] | 472 |  | (49) | [4] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (213) | [3] | $ 65 | [4] | 472 |  | (49) | [4] |  |  |  |  |  |  |  |
Transfers out of Level 3, Liabilities |  | $ 0 |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |  |  |
[1] | The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets.
[3] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $1,372 million at June 30, 2020, and $1,591 million at March 31, 2020, which includes a fair value derivative adjustment of $928 million and $1,141 million, respectivel
[4] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the Consolidated balance sheets. The liability for GLB reinsurance was $815 million at June 30, 2019, and $741 million at March 31, 2019, which includes a fair value derivative adjustment of $403 million and $338 million, respectively

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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&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=117815213&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=117815213&loc=d3e19207-110258 + Details
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