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v3.19.3

Fair Value Measurements (Assets Measured At Fair Value Using Significant Unobservable Inputs) (Detail) - Level 3 - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Foreign |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | $ 371 | $ 252 |  | $ 345 | $ 93 |
Transfers Into Level 3, Asset | 0 | 5 |  | 3 | 12 |
Transfers out of Level 3, Assets | 0 | (2) |  | (15) | (2) |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | (8) | (2) |  | (2) | 0 |
Net Realized Gains/ (Losses), Assets | 0 | (2) |  | (1) | (2) |
Purchases, Assets | 68 | 98 |  | 164 | 280 |
Sales, Assets | (35) | (22) |  | (54) | (52) |
Settlements, Assets | (3) | (4) |  | (47) | (6) |
Balance-End of Period, Assets | 393 | 323 |  | 393 | 323 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | (1) |  | 0 | (1) |
Corporate securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | 1,359 | 1,181 |  | 1,299 | 1,037 |
Transfers Into Level 3, Asset | 1 | 18 |  | 16 | 24 |
Transfers out of Level 3, Assets | 0 | (21) |  | 0 | (31) |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | (4) | 7 |  | 1 | (5) |
Net Realized Gains/ (Losses), Assets | 0 | (6) |  | 0 | (4) |
Purchases, Assets | 176 | 98 | [1] | 425 | 454 | [1]
Sales, Assets | (18) | (18) |  | (91) | (114) |
Settlements, Assets | (64) | (85) |  | (200) | (187) |
Balance-End of Period, Assets | 1,450 | 1,174 |  | 1,450 | 1,174 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | (6) |  | (1) | (6) |
Mortgage-backed securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | 76 | 82 |  | 61 | 78 |
Transfers Into Level 3, Asset | 0 | 0 |  | 0 | 1 |
Transfers out of Level 3, Assets | 0 | 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 | 1 |  | 19 | 5 |
Sales, Assets | 0 | 0 |  | (1) | 0 |
Settlements, Assets | 0 | (18) |  | (2) | (19) |
Balance-End of Period, Assets | 77 | 65 |  | 77 | 65 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | 0 |  | 0 | 0 |
Equity Securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | 56 | 59 |  | 57 | 44 |
Transfers Into Level 3, Asset | 0 | 0 |  | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 |  | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | (1) | (1) |  | 1 | 0 |
Net Realized Gains/ (Losses), Assets | (1) | 7 |  | (4) | 6 |
Purchases, Assets | 5 | 6 |  | 19 | 26 |
Sales, Assets | (3) | (18) |  | (17) | (23) |
Settlements, Assets | 0 | 0 |  | 0 | 0 |
Balance-End of Period, Assets | 56 | 53 |  | 56 | 53 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | (1) | 1 |  | (3) | 0 |
Short-term Investments [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | 4 | 12 |  | 1 | 0 |
Transfers Into Level 3, Asset | 0 | 0 |  | 0 | 5 |
Transfers out of Level 3, Assets | 0 | 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 | 2 | 0 |  | 6 | 9 |
Sales, Assets | 0 | 0 |  | 0 | 0 |
Settlements, Assets | 0 | (6) |  | (1) | (8) |
Balance-End of Period, Assets | 6 | 6 |  | 6 | 6 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 0 | 0 |  | 0 | 0 |
Other Long-term Investments [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Balance- Beginning of Period, Assets | 11 | 264 |  | 11 | 263 |
Transfers Into Level 3, Asset | 0 | 0 |  | 0 | 0 |
Transfers out of Level 3, Assets | 0 | 0 |  | 0 | 0 |
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | (4) |  | 0 | (2) |
Net Realized Gains/ (Losses), Assets | 0 | 0 |  | 0 | 1 |
Purchases, Assets | 0 | 20 |  | 0 | 50 |
Sales, Assets | 0 | 0 |  | 0 | 0 |
Settlements, Assets | (1) | (17) |  | (1) | (49) |
Balance-End of Period, Assets | 10 | 263 |  | 10 | 263 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | $ 0 | $ 0 |  | $ 0 | $ 1 |
[1] | Purchases in Level 3 primarily consist of privately-placed fixed income securities.

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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 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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