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Restructuring Expense, Summary of Changes in Restructuring Liability (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary in changes in liability established for restructuring [Roll Forward]    
Beginning balance $ 0 $ 15
Restructuring expense 0 2
Cash (payments) receipts 1 (13)
Ending balance $ 1 $ 4