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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | $ 78 |  | $ 64 |  | $ 73 |  | $ 69 |
Transfers Into Level 3, Asset | 0 |  |  |  | 0 |  | 0 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 0 |  | 0 |  | 0 |
Net Realized Gains/ (Losses), Assets | 1 |  | 2 |  | 8 |  | (1) |
Purchases, Assets | 4 |  | 3 |  | 11 |  | 14 |
Sales, Assets | (4) |  | (3) |  | (13) |  | (16) |
Settlements, Assets | 0 |  | 0 |  | 0 |  | 0 |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 79 |  | 66 |  | 79 |  | 66 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | (1) |  | 2 |  | 5 |  | 1 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Short-term Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | 3 |  | 2 |  | 5 |  | 6 |
Transfers Into Level 3, Asset | 0 |  |  |  | 0 |  | 0 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | (1) |  | 0 |  | (1) |
Net Realized Gains/ (Losses), Assets | 0 |  | 0 |  | 0 |  | 0 |
Purchases, Assets | 7 |  | 7 |  | 10 |  | 9 |
Sales, Assets | 0 |  | 0 |  | 0 |  | 0 |
Settlements, Assets | 0 |  | (1) |  | (5) |  | (7) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 10 |  | 7 |  | 10 |  | 7 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | (1) |  | 0 |  | (1) |
Other Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance- Beginning of Period, Assets | 10 |  | 10 |  | 10 |  | 10 |
Transfers Into Level 3, Asset | 0 |  |  |  | 0 |  | 0 |
Transfers out of Level 3, Assets | (10) |  | 0 |  | (10) |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 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 |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 0 |  | 10 |  | 0 |  | 10 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
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 | 642 |  | 469 |  | 546 |  | 449 |
Transfers Into Level 3, Asset | 22 |  |  |  | 22 |  | 0 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | (10) |  | (16) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | (15) |  | 21 |  | (2) |  | 1 |
Net Realized Gains/ (Losses), Assets | (3) |  | 1 |  | 0 |  | (2) |
Purchases, Assets | 60 |  | 41 |  | 235 |  | 190 |
Sales, Assets | (19) |  | (19) |  | (35) |  | (81) |
Settlements, Assets | (27) |  | (19) |  | (96) |  | (47) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 660 |  | 494 |  | 660 |  | 494 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | (15) |  | 20 |  | 2 |  | 0 |
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 | 1,688 |  | 1,369 |  | 1,573 |  | 1,451 |
Transfers Into Level 3, Asset | 45 |  |  |  | 91 |  | 92 |
Transfers out of Level 3, Assets | 0 |  | (1) |  | (3) |  | (73) |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 2 |  | (13) |  | 14 |  | (31) |
Net Realized Gains/ (Losses), Assets | 0 |  | 3 |  | 3 |  | (23) |
Purchases, Assets | 272 |  | 194 |  | 681 |  | 416 |
Sales, Assets | (13) |  | (80) |  | (88) |  | (147) |
Settlements, Assets | (135) |  | (54) |  | (412) |  | (240) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 1,859 |  | 1,445 |  | 1,859 |  | 1,445 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 3 |  | 3 |  | (6) |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 12 |  | 17 |  | (25) |
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 | 47 |  | 60 |  | 60 |  | 60 |
Transfers Into Level 3, Asset | 0 |  |  |  | 0 |  | 0 |
Transfers out of Level 3, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains (Losses) included in OCI, Assets | 0 |  | 0 |  | 0 |  | 0 |
Net Realized Gains/ (Losses), Assets | 0 |  | 0 |  | 0 |  | 0 |
Purchases, Assets | 17 |  | 2 |  | 18 |  | 2 |
Sales, Assets | 0 |  | 0 |  | (1) |  | 0 |
Settlements, Assets | (11) |  | (1) |  | (24) |  | (1) |
Other, Assets | 0 |  | 0 |  | 0 |  | 0 |
Balance-End of Period, Assets | 53 |  | 61 |  | 53 |  | 61 |
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Assets | 0 |  | 0 |  | 0 |  | 0 |
Guaranteed Minimum Income Benefit [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Balance - Beginning of Period, Liabilities | 760 | [1] | 1,372 | [2] | 1,089 |  | 897 |
Transfers into level 3, liability | 0 |  |  |  | 0 |  | 0 |
Transfers out of Level 3, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Change in Net Unrealized Gains (losses) included in OCI, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Net Realized Gains/(Losses), Liabilities | 59 | [1] | (46) | [2] | (252) |  | 426 |
Purchases, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Sales, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Settlements, Liabilities | 0 |  | 0 |  | 0 |  | 0 |
Other, Liabilities | (1) |  | (8) |  | (19) |  | (5) |
Balance - End of Period, Liabilities | 818 | [1] | 1,318 | [2] | 818 | [1] | 1,318 | [2]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities | 59 | [1] | (46) | [2] | (252) |  | 426 |
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date, Liabilities | $ 0 |  | $ 0 |  | $ 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=123874694&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=123874694&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=123874694&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=123874694&loc=d3e19207-110258 + Details
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