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Equity - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period $ 2,388    
Balance at the end of the period 2,720 $ 2,388  
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (1,080) (951) $ (1,008)
Other comprehensive loss before reclassification adjustments (9) (129) 57
Net other comprehensive income (loss) (9) (129) 57
Balance at the end of the period (1,089) (1,080) (951)
(Loss) Gain on Hedging Activities, After adoption of ASU 2017-12      
Accumulated Other Comprehensive Loss      
Other comprehensive loss before reclassification adjustments (19)    
Amount reclassified from accumulated OCI 14    
Tax benefit (provision) 1    
Net other comprehensive income (loss) (4)    
Balance at the end of the period (9)    
(Loss) Gain on Hedging Activities, Prior to adoption of ASU 2017-12      
Accumulated Other Comprehensive Loss      
Balance at the beginning of the period (5) (13) (7)
Other comprehensive loss before reclassification adjustments   8 (16)
Amount reclassified from accumulated OCI   6 6
Tax benefit (provision)   (4) 4
Net other comprehensive income (loss)   10 (6)
Other   (2)  
Balance at the end of the period   (5) (13)
(Loss) Gain on Hedging Activities, Prior to adoption of ASU 2017-12 | 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) (56)
Other comprehensive loss before reclassification adjustments 11 (20) 8
Amount reclassified from accumulated OCI     (2)
Tax benefit (provision) (2) 5 (1)
Net other comprehensive income (loss) 9 (15) 5
Other   (3)  
Balance at the end of the period (60) (69) (51)
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  
Other comprehensive loss before reclassification adjustments     3
Tax benefit (provision)     (1)
Net other comprehensive income (loss)     2
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 (1,154) (1,013) (1,071)
Other comprehensive loss before reclassification adjustments (17) (141) 52
Amount reclassified from accumulated OCI 14 6 4
Tax benefit (provision) (1) 1 2
Net other comprehensive income (loss) (4) (134) 58
Other   (7)  
Balance at the end of the period $ (1,158) (1,154) $ (1,013)
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)