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Equity - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period $ 2,891    
Balance at the end of the period 2,388 $ 2,891  
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (951) (1,008) $ (1,025)
Other comprehensive (loss) income before reclassification adjustments (129) 57 17
Net other comprehensive (loss) income (129) 57 17
Balance at the end of the period (1,080) (951) (1,008)
Deferred (Loss) Gain on Hedging Activities      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (13) (7) (29)
Other comprehensive (loss) income before reclassification adjustments 8 (16) (17)
Amount reclassified from accumulated OCI 6 6 49
Tax (provision) benefit (4) 4 (10)
Net other comprehensive (loss) income 10 (6) 22
Other (2)    
Balance at the end of the period (5) (13) (7)
Deferred (Loss) Gain on Hedging Activities | ASU 2018-02      
Accumulated Other Comprehensive Loss      
Adoption of ASU (2)    
Pension and other postretirement plans      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (51) (56) (47)
Other comprehensive (loss) income before reclassification adjustments (20) 8 (14)
Amount reclassified from accumulated OCI   (2) 1
Tax (provision) benefit 5 (1) 4
Net other comprehensive (loss) income (15) 5 (9)
Other (3)    
Balance at the end of the period (69) (51) (56)
Pension and other postretirement plans | ASU 2018-02      
Accumulated Other Comprehensive Loss      
Adoption of ASU (3)    
Unrealized (Loss) Gain on Investment      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period 2   (1)
Other comprehensive (loss) income before reclassification adjustments   3 1
Tax (provision) benefit   (1)  
Net other comprehensive (loss) income   2 1
Other (2)    
Balance at the end of the period   2  
Unrealized (Loss) Gain on Investment | ASU 2016-01      
Accumulated Other Comprehensive Loss      
Adoption of ASU (2)    
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (1,013) (1,071) (1,102)
Other comprehensive (loss) income before reclassification adjustments (141) 52 (13)
Amount reclassified from accumulated OCI 6 4 50
Tax (provision) benefit 1 2 (6)
Net other comprehensive (loss) income (134) 58 31
Other (7)    
Balance at the end of the period (1,154) $ (1,013) $ (1,071)
Accumulated Other Comprehensive Loss | ASU 2016-01      
Accumulated Other Comprehensive Loss      
Adoption of ASU (2)    
Accumulated Other Comprehensive Loss | ASU 2018-02      
Accumulated Other Comprehensive Loss      
Adoption of ASU $ (5)