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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2018
OTTI Gains (Losses) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | $ (1) | $ 1 | $ (2) | $ 3 |
Tax on reclassification from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Unrealized Gains (Losses) on Investments [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | (114) | 45 | (254) | 150 |
Tax on reclassification from accumulated other comprehensive income | 0 | 1 | (1) | 5 |
Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 2 | 0 | 4 | (2) |
Tax on reclassification from accumulated other comprehensive income | 0 | 0 | 0 | 0 |
Pension Liability [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |
Tax on reclassification from accumulated other comprehensive income | (3) | (2) | (5) | (5) |
Foreign Currency Translation [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on change in other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0 |
Tax on reclassification from accumulated other comprehensive income | $ 0 | $ 0 | $ 0 | $ 0 |
Accounting Standards Update 2016-01 [Member] | OTTI Gains (Losses) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on cumulative effect adjustment for adoption of ASU 2016-01 |  |  |  |  | $ 0
Accounting Standards Update 2016-01 [Member] | Unrealized Gains (Losses) on Investments [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on cumulative effect adjustment for adoption of ASU 2016-01 |  |  |  |  | 8
Accounting Standards Update 2016-01 [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on cumulative effect adjustment for adoption of ASU 2016-01 |  |  |  |  | 0
Accounting Standards Update 2016-01 [Member] | Pension Liability [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on cumulative effect adjustment for adoption of ASU 2016-01 |  |  |  |  | 0
Accounting Standards Update 2016-01 [Member] | Foreign Currency Translation [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Tax on cumulative effect adjustment for adoption of ASU 2016-01 |  |  |  |  | $ 0

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