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Accumulated Other Comprehensive Loss (AOCL) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in Accumulated Other Comprehensive Loss (AOCL) [Roll Forward]    
Balance at beginning of period $ (425) $ (494)
Other comprehensive income (loss) before reclassifications 8 8
Net current period other comprehensive income (loss) 14 5
Other Comprehensive Income (Loss), Net 22 13
Balance at end of period (403) (481)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]    
Changes in Accumulated Other Comprehensive Loss (AOCL) [Roll Forward]    
Balance at beginning of period (426) (437)
Other comprehensive income (loss) before reclassifications 7 9
Net current period other comprehensive income (loss) 15 5
Other Comprehensive Income (Loss), Net 22 14
Balance at end of period (404) (423)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]    
Changes in Accumulated Other Comprehensive Loss (AOCL) [Roll Forward]    
Balance at beginning of period 2 1
Other comprehensive income (loss) before reclassifications 1 (1)
Net current period other comprehensive income (loss) 0 0
Other Comprehensive Income (Loss), Net 1 (1)
Balance at end of period 3 0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]    
Changes in Accumulated Other Comprehensive Loss (AOCL) [Roll Forward]    
Balance at beginning of period (1) (58)
Other comprehensive income (loss) before reclassifications 0 0
Net current period other comprehensive income (loss) (1) 0
Other Comprehensive Income (Loss), Net (1) 0
Balance at end of period $ (2) $ (58)