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Tax - Deferred Taxes by Territory Explanatory (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | $ 101 | $ 203 | $ 86
Deferred gains on loan notes [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 34 | 52 | 55
Deferred gains on investments [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 54 | 78 | 87
Losses [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (40) | (44) | (67)
Employee benefits [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (20) | (27) | (32)
Other short-term temporary differences [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (83) | (95) | (196)
United Kingdom [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (49) |  |
United Kingdom [member] | Losses [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (17) |  |
United Kingdom [member] | Employee benefits [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (5) |  |
United Kingdom [member] | Other short-term temporary differences [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (19) |  |
United States [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 130 |  |
United States [member] | Deferred gains on loan notes [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 34 |  |
United States [member] | Deferred gains on investments [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 54 |  |
United States [member] | Losses [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (15) |  |
United States [member] | Employee benefits [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (15) |  |
United States [member] | Other short-term temporary differences [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (60) |  |
Other Countries [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 20 |  |
Other Countries [member] | Losses [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (8) |  |
Other Countries [member] | Other short-term temporary differences [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (4) |  |
Property, plant and equipment [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 98 | 120 | 99
Property, plant and equipment [member] | United Kingdom [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (5) |  |
Property, plant and equipment [member] | United States [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 103 |  |
Intangible assets [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 58 | $ 60 | $ 70
Intangible assets [member] | United Kingdom [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | (3) |  |
Intangible assets [member] | United States [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | 29 |  |
Intangible assets [member] | Other Countries [member] |  |  |
Disclosure Of Deferred Taxes [Line Items] |  |  |
Deferred tax liability asset | $ 32 |  |

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