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Other Non-Current Assets (Schedule of Other Non-Current Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Investments, All Other Investments [Abstract]    
Deferred taxes $ 399 $ 593
Pension assets 313 14
Debt issuance costs 13 6
Investments 9 4
Other 98 58
Other non-current assets $ 832 $ 675