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Quarterly Results (Unaudited) - Additional Information (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 04, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss on disposal group held for sale |  |  | $ 27 |  |  |  |  | $ (27) |  |  |
Tax charge to recognize tax reform legislation | $ 186 |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 6 |  | $ 13 | $ 6 |  | $ 17 | 19 | 17 | 2 |
Loss on sale of subsidiaries |  |  |  |  |  | $ 80 |  |  | $ 80 |  |
After tax loss on sale of subsidiaries |  |  |  |  |  | 52 |  |  |  |  |
Change in valuation allowance |  |  |  |  |  | (476) |  |  |  |  |
BRAZIL |  |  |  |  |  |  |  |  |  |  |
Change in valuation allowance |  |  |  |  |  | 25 |  |  |  |  |
UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Change in valuation allowance |  |  | $ (27) |  |  | $ (501) |  |  |  | $ (66) | $ (179)

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