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Shareholders' Equity, Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in accumulated other comprehensive loss by component [Roll Forward]    
Balance $ 1,153  
Other comprehensive income (loss) 16 $ 40
Amounts reclassified from accumulated other comprehensive loss 1 1
Balance 1,144  
Accumulated Other Comprehensive Loss [Member]    
Changes in accumulated other comprehensive loss by component [Roll Forward]    
Balance (497) (598)
Balance (480) (557)
Cumulative Translation Adjustment [Member]    
Changes in accumulated other comprehensive loss by component [Roll Forward]    
Balance (408) (496)
Other comprehensive income (loss) 18 40
Amounts reclassified from accumulated other comprehensive loss 0 0
Balance (390) (456)
Pension Liability Adjustment [Member]    
Changes in accumulated other comprehensive loss by component [Roll Forward]    
Balance (92) (102)
Other comprehensive income (loss) 0 0
Amounts reclassified from accumulated other comprehensive loss 1 1
Balance (91) (101)
Unrealized Gains (Losses) on Derivatives [Member]    
Changes in accumulated other comprehensive loss by component [Roll Forward]    
Balance 3 0
Other comprehensive income (loss) (2) 0
Amounts reclassified from accumulated other comprehensive loss 0 0
Balance $ 1 $ 0