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Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Level 3 | Foreign |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | $ 449 |  | $ 345 |  |  |  |  |
Transfers Into Level 3, Asset |  | 0 |  | 3 |  |  |  |  |
Transfers out of Level 3, Assets |  | (3) |  | (15) |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (14) |  | 6 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (2) |  | (1) |  |  |  |  |
Purchases, Assets |  | 82 |  | 53 |  |  |  |  |
Sales, Assets |  | (46) |  | (5) |  |  |  |  |
Settlements, Assets |  | (1) |  | (26) |  |  |  |  |
Balance-End of Period, Assets |  | 465 |  | 360 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  |  |  |  |
Level 3 | Corporate securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 1,451 |  | 1,299 |  |  |  |  |
Transfers Into Level 3, Asset |  | 91 |  | 5 |  |  |  |  |
Transfers out of Level 3, Assets |  | (1) |  | 0 |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (45) |  | 4 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (13) |  | 1 |  |  |  |  |
Purchases, Assets |  | 139 |  | 128 | [1] |  |  |  |
Sales, Assets |  | (19) |  | (37) |  |  |  |  |
Settlements, Assets |  | (101) |  | (58) |  |  |  |  |
Balance-End of Period, Assets |  | 1,502 |  | 1,342 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (14) |  | 0 |  |  |  |  |
Level 3 | Mortgage-backed securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 60 |  | 61 |  |  |  |  |
Transfers Into Level 3, Asset |  | 0 |  | 0 |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  | 0 |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  |  |  |  |
Purchases, Assets |  | 0 |  | 18 |  |  |  |  |
Sales, Assets |  | 0 |  | 0 |  |  |  |  |
Settlements, Assets |  | 0 |  | (1) |  |  |  |  |
Balance-End of Period, Assets |  | 60 |  | 78 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 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 |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 69 |  | 57 |  |  |  |  |
Transfers Into Level 3, Asset |  | 0 |  | 0 |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  | 0 |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 1 |  | 1 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | (2) |  | (2) |  |  |  |  |
Purchases, Assets |  | 3 |  | 9 |  |  |  |  |
Sales, Assets |  | (4) |  | (10) |  |  |  |  |
Settlements, Assets |  | 0 |  | 0 |  |  |  |  |
Balance-End of Period, Assets |  | 67 |  | 55 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (2) |  | (1) |  |  |  |  |
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 |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 6 |  | 1 |  |  |  |  |
Transfers Into Level 3, Asset |  | 0 |  | 0 |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  | 0 |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  |  |  |  |
Purchases, Assets |  | 1 |  | 0 |  |  |  |  |
Sales, Assets |  | 0 |  | 0 |  |  |  |  |
Settlements, Assets |  | (6) |  | (1) |  |  |  |  |
Balance-End of Period, Assets |  | 1 |  | 0 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 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 |  |  |  |  |  |  |
Balance- Beginning of Period, Assets |  | 10 |  | 11 |  |  |  |  |
Transfers Into Level 3, Asset |  | 0 |  | 0 |  |  |  |  |
Transfers out of Level 3, Assets |  | 0 |  | 0 |  |  |  |  |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  |  |  |  |
Net Realized Gains/ (Losses), Assets |  | 0 |  | 0 |  |  |  |  |
Purchases, Assets |  | 0 |  | 0 |  |  |  |  |
Sales, Assets |  | 0 |  | 0 |  |  |  |  |
Settlements, Assets |  | 0 |  | 0 |  |  |  |  |
Balance-End of Period, Assets |  | 10 |  | 11 |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  | 0 |  |  |  |  |
Available-for-sale Securities [Member] | Level 3 | Foreign |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | (15) |  |  |  |  |  |  |
Available-for-sale Securities [Member] | Level 3 | Corporate securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), OCI |  | (44) |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  | 1,141 |  | 338 |  | $ 456 |  | $ 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 |  |  |  |  |  |  |
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 | [2] | 1,141 |  |  |  | 456 | [3] |  |
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 |  | $ 1,141 | [4] | $ 338 | [5] | $ 456 | [4] | $ 452 | [5]
[1] |
| Assets |  |  | Liabilities |
Three Months Ended | Available-for-Sale Debt Securities |  |  | Equity securities |  |  | Short-term investments |  |  | Other investments |  |  | GLB (1) |
March 31, 2019 | Foreign |  |  | Corporate securities |  |  | MBS |  |  |
(in millions of U.S. dollars) |  |  |  |
Balance – beginning of period | $ | 345 |  |  | $ | 1,299 |  |  | $ | 61 |  |  | $ | 57 |  |  | $ | 1 |  |  | $ | 11 |  |  | $ | 452 |
Transfers into Level 3 | 3 |  |  | 5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Transfers out of Level 3 | (15 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Change in Net Unrealized Gains/Losses in OCI, including foreign exchange | 6 |  |  | 4 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Net Realized Gains/Losses | (1 | ) |  | 1 |  |  | — |  |  | (2 | ) |  | — |  |  | — |  |  | (114 | )
Purchases | 53 |  |  | 128 |  |  | 18 |  |  | 9 |  |  | — |  |  | — |  |  | — |
Sales | (5 | ) |  | (37 | ) |  | — |  |  | (10 | ) |  | — |  |  | — |  |  | — |
Settlements | (26 | ) |  | (58 | ) |  | (1 | ) |  | — |  |  | (1 | ) |  | — |  |  | — |
Balance – end of period | $ | 360 |  |  | $ | 1,342 |  |  | $ | 78 |  |  | $ | 55 |  |  | $ | — |  |  | $ | 11 |  |  | $ | 338 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | (114 | )
[2] | The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.
[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.
[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 $1,591 million at March 31, 2020, and $897 million at December 31, 2019, which includes a fair value derivative adjustment of $1,141 million and $456 million, respectivel
[5] | 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 $741 million at March 31, 2019, and $861 million at December 31, 2018, which includes a fair value derivative adjustment of $338 million and $452 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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