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Income Tax - Gross Deferred Tax Assets on Tax Loss Carryforwards and Investment Credits Expiration (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
2017 | $ 16 |
2018 | 89 |
2019 | 80 |
2020 | 16 |
2021 | 3 |
Thereafter | 600 |
Total | $ 804 | $ 827

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