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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Mortgage-backed securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | $ 82 |  | $ 45 | $ 78 | $ 45
Transfers Into Level 3, Asset | 0 |  | 0 | 1 | 0
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 |  | 7 | 5 | 8
Sales, Assets | 0 |  | 0 | 0 | (1)
Settlements, Assets | (18) |  | (8) | (19) | (8)
Balance-End of Period, Assets | 65 |  | 44 | 65 | 44
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 | 0 | 0
Corporate securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 1,181 |  | 747 | 1,037 | 681
Transfers Into Level 3, Asset | 18 |  | 111 | 24 | 168
Transfers out of Level 3, Assets | (21) |  | (26) | (31) | (93)
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | 7 |  | (1) | (5) | (9)
Net Realized Gains/ (Losses), Assets | (6) |  | 0 | (4) | (1)
Purchases, Assets | 98 | [1] | 169 | 454 | 390
Sales, Assets | (18) |  | (24) | (114) | (79)
Settlements, Assets | (85) |  | (57) | (187) | (138)
Balance-End of Period, Assets | 1,174 |  | 919 | 1,174 | 919
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (6) |  | 0 | (6) | 0
Foreign |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 252 |  | 85 | 93 | 74
Transfers Into Level 3, Asset | 5 |  | 0 | 12 | 0
Transfers out of Level 3, Assets | (2) |  | (3) | (2) | (3)
Asset, Net realized Gain (Loss) Included in Other Comprehensive Income (Loss) | (2) |  | 1 | 0 | 3
Net Realized Gains/ (Losses), Assets | (2) |  | 0 | (2) | 1
Purchases, Assets | 98 |  | 24 | 280 | 57
Sales, Assets | (22) |  | (14) | (52) | (36)
Settlements, Assets | (4) |  | (3) | (6) | (6)
Balance-End of Period, Assets | 323 |  | 90 | 323 | 90
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (1) |  | 0 | (1) | 0
Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 59 |  | 39 | 44 | 41
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) |  | 0 | 0 | 1
Net Realized Gains/ (Losses), Assets | 7 |  | 1 | 6 | 1
Purchases, Assets | 6 |  | 17 | 26 | 23
Sales, Assets | (18) |  | (5) | (23) | (14)
Settlements, Assets | 0 |  | 0 | 0 | 0
Balance-End of Period, Assets | 53 |  | 52 | 53 | 52
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 1 |  | 0 | 0 | 0
Short-term Investments [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Balance- Beginning of Period, Assets | 12 |  | 7 | 0 | 25
Transfers Into Level 3, Asset | 0 |  | 0 | 5 | 0
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 | 0 |  | 1 | 9 | 15
Sales, Assets | 0 |  | 0 | 0 | 0
Settlements, Assets | (6) |  | (8) | (8) | (40)
Balance-End of Period, Assets | 6 |  | 0 | 6 | 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | 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 | 264 |  | 243 | 263 | 225
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) | (4) |  | 0 | (2) | 3
Net Realized Gains/ (Losses), Assets | 0 |  | 0 | 1 | 0
Purchases, Assets | 20 |  | 15 | 50 | 39
Sales, Assets | 0 |  | 0 | 0 | 0
Settlements, Assets | (17) |  | (6) | (49) | (15)
Balance-End of Period, Assets | 263 |  | 252 | 263 | 252
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | $ 0 |  | $ 0 | $ 1 | $ 0
[1] | Purchases in Level 3 primarily consist of privately-placed fixed income securities.

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for 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)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&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=99377789&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=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of settlement 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=99377789&loc=d3e19207-110258 + Details
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