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Other Financial Data - Other Income (Expense) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Interest expense, net:      
Interest expense $ (215,000,000) $ (225,000,000) $ (186,000,000)
Interest income 14,000,000 20,000,000 13,000,000
Interest expense, net: (201,000,000) (205,000,000) (173,000,000)
Other:      
Loss from the extinguishment of long-term debt 0 (2,000,000) 0
Investment impairments 0 (4,000,000) (6,000,000)
Foreign currency gain (loss) (31,000,000) 46,000,000 (23,000,000)
Gain (loss) on derivative instruments 15,000,000 (56,000,000) 7,000,000
Gains on equity method investments 1,000,000 5,000,000 6,000,000
Realized foreign currency loss on acquisition 0 (10,000,000) 0
Other 7,000,000 9,000,000 5,000,000
Total other $ (8,000,000) $ (12,000,000) $ (11,000,000)