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Pension and Other Benefit Programs - Change to US Operations SERP Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:      
Benefit obligation at beginning of year $ 791 $ 875  
Interest cost 28 26 $ 27
Actuarial (gain) loss 90 (61)  
Benefit obligation at year end 861 791 875
Funded status 33 3  
Defined Benefit Plan SERP Benefit Obligation Estimated Future Benefit Payments [Abstract]      
2020 49    
2021 50    
2022 49    
2023 49    
2024 49    
Next 5 years 243    
Supplemental Employee Retirement Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 41 49  
Interest cost 1 1  
Actuarial (gain) loss 4 (2)  
Benefits paid (5) (7)  
Benefit obligation at year end 41 41 $ 49
Funded status (41) (41)  
Amounts recognized in the accompanying consolidated balance sheets:      
Other current liabilities (5) (5)  
Accrued employee benefits (36) $ (36)  
Defined Benefit Plan SERP Benefit Obligation Estimated Future Benefit Payments [Abstract]      
2020 5    
2021 5    
2022 4    
2023 4    
2024 3    
Next 5 years $ 13