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Equity - AOCI (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period $ 2,388  
Balance at the end of the period 2,596  
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (1,080) $ (951)
Other comprehensive (loss) income before reclassification adjustments (3) (96)
Net other comprehensive income (loss) (3) (96)
Balance at the end of the period (1,083) (1,047)
(Loss) Gain on Hedging Activities, ASU 2017-12    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (5)  
Other comprehensive (loss) income before reclassification adjustments 1  
Amount reclassified from accumulated OCI 6  
Tax (provision) benefit (1)  
Net other comprehensive income (loss) 6  
Balance at the end of the period 1  
(Loss) Gain on Hedging Activities    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period   (13)
Other comprehensive (loss) income before reclassification adjustments   1
Amount reclassified from accumulated OCI   3
Tax (provision) benefit   (1)
Net other comprehensive income (loss)   3
Balance at the end of the period   (10)
Pension and other postretirement plans    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (69) (51)
Other comprehensive (loss) income before reclassification adjustments (1) (1)
Net other comprehensive income (loss) (1) (1)
Balance at the end of the period (70) (52)
Unrealized (Loss) Gain on Investment    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period   2
Other comprehensive (loss) income before reclassification adjustments   1
Net other comprehensive income (loss)   1
Balance at the end of the period   3
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (1,154) (1,013)
Other comprehensive (loss) income before reclassification adjustments (3) (95)
Amount reclassified from accumulated OCI 6 3
Tax (provision) benefit (1) (1)
Net other comprehensive income (loss) 2 (93)
Balance at the end of the period $ (1,152) $ (1,106)