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Equity - AOCI (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period $ 2,388  
Balance at the end of the period 2,593  
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (1,080) $ (951)
Other comprehensive loss before reclassification adjustments (48) (113)
Net other comprehensive income (loss) (48) (113)
Balance at the end of the period (1,128) (1,064)
(Loss) Gain on Hedging Activities, ASU 2017-12    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period (5)  
Other comprehensive loss before reclassification adjustments (16)  
Amount reclassified from accumulated OCI 3  
Tax benefit (provision) 3  
Net other comprehensive income (loss) (10)  
Balance at the end of the period (15)  
(Loss) Gain on Hedging Activities    
Accumulated Other Comprehensive Loss    
Balance at the beginning of the period   (13)
Other comprehensive loss before reclassification adjustments   (1)
Amount reclassified from accumulated OCI   5
Tax benefit (provision)   (1)
Net other comprehensive income (loss)   1
Balance at the end of the period   (12)
(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 (69) (51)
Other comprehensive loss before reclassification adjustments (2) (1)
Net other comprehensive income (loss) (2) (4)
Balance at the end of the period (71) (55)
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
Net other comprehensive income (loss)   (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 (1,154) (1,013)
Other comprehensive loss before reclassification adjustments (66) (115)
Amount reclassified from accumulated OCI 3 5
Tax benefit (provision) 3 (1)
Net other comprehensive income (loss) (60) (118)
Balance at the end of the period $ (1,214) (1,131)
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)