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Fair Value Measurements (Assets and Liabilities, Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - Level 3 - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Equity Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | $ 73 |  | $ 69 |
Transfers Into Level 3, Asset | 0 |  | 0 |
Transfers out of Level 3, Assets |  |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 1 |
Net Realized Gains/ (Losses), Assets | 2 |  | (2) |
Purchases, Assets | 3 |  | 3 |
Sales, Assets | (3) |  | (4) |
Settlements, Assets | 0 |  | 0 |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 2 |  | (2) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |
Balance-End of Period, Assets | 75 |  | 67 |
Short-term Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 5 |  | 6 |
Transfers Into Level 3, Asset | 0 |  | 0 |
Transfers out of Level 3, Assets |  |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 0 |
Net Realized Gains/ (Losses), Assets | 0 |  | 0 |
Purchases, Assets | 1 |  | 1 |
Sales, Assets | 0 |  | 0 |
Settlements, Assets | (5) |  | (6) |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |
Balance-End of Period, Assets | 1 |  | 1 |
Other Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 10 |  | 10 |
Transfers Into Level 3, Asset | 0 |  | 0 |
Transfers out of Level 3, Assets |  |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 0 |
Net Realized Gains/ (Losses), Assets | 0 |  | 0 |
Purchases, Assets | 0 |  | 0 |
Sales, Assets | 0 |  | 0 |
Settlements, Assets | 0 |  | 0 |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |
Balance-End of Period, Assets | 10 |  | 10 |
Available-for-sale Securities [Member] | Non-U.S. |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 546 |  | 449 |
Transfers Into Level 3, Asset | 0 |  | 0 |
Transfers out of Level 3, Assets |  |  | (3) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 8 |  | (14) |
Net Realized Gains/ (Losses), Assets | 0 |  | (2) |
Purchases, Assets | 121 |  | 82 |
Sales, Assets | (7) |  | (46) |
Settlements, Assets | (18) |  | (1) |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 10 |  | (15) |
Balance-End of Period, Assets | 650 |  | 465 |
Available-for-sale Securities [Member] | Corporate and asset-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 1,573 |  | 1,451 |
Transfers Into Level 3, Asset | 17 |  | 91 |
Transfers out of Level 3, Assets |  |  | (1) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 6 |  | 45 |
Net Realized Gains/ (Losses), Assets | (3) |  | (13) |
Purchases, Assets | 169 |  | 139 |
Sales, Assets | (25) |  | (19) |
Settlements, Assets | (125) |  | (101) |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (3) |  | (14) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 11 |  | (44) |
Balance-End of Period, Assets | 1,612 |  | 1,502 |
Available-for-sale Securities [Member] | Mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance- Beginning of Period, Assets | 60 |  | 60 |
Transfers Into Level 3, Asset | 0 |  | 0 |
Transfers out of Level 3, Assets |  |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 0 |
Net Realized Gains/ (Losses), Assets | 0 |  | 0 |
Purchases, Assets | 0 |  | 0 |
Sales, Assets | 0 |  | 0 |
Settlements, Assets | (9) |  | 0 |
Other, Assets | 0 |  | 0 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |
Balance-End of Period, Assets | 51 |  | 60 |
Guaranteed Minimum Income Benefit [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance - Beginning of Period, Liabilities | 1,089 | [1] | 897 | [2]
Transfers into level 3, liability | 0 |  | 0 |
Transfers out of Level 3, Liabilities |  |  | 0 |
Change in Net Unrealized Gains (losses) included in OCI, Liabilities | 0 |  | 0 |
Net Realized Gains/(Losses), Liabilities | (319) | [1] | 685 | [2]
Purchases, Liabilities | 0 |  | 0 |
Sales, Liabilities | 0 |  | 0 |
Settlements, Liabilities | 0 |  | 0 |
Other, Liabilities | (10) |  | 9 |
Balance - End of Period, Liabilities | 760 | [1] | 1,591 | [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | (319) | [1] | 685 | [2]
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Liabilities | $ 0 |  | $ 0 |
[1] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
[2] | Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

X
- 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 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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