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Income Taxes - Deferred income taxes (assets and liabilities netted by jurisdiction) as classified in the Consolidated Statements of Financial Position (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income taxes |  |
Deferred tax assets — non-current (2) | $ 322 | $ 300
Deferred tax liabilities — non-current (2) | (101) | (37)
Net deferred tax asset | $ 221 | $ 263

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