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Leases Lessee Disclosure - ASC 840 Disclosures (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Leases [Abstract]      
2019 $ 156,000,000    
2020 136,000,000    
2021 113,000,000    
2022 90,000,000    
2023 75,000,000    
Thereafter 175,000,000    
Operating Leases, Future Minimum Payments Due 745,000,000    
Capital Leases, Future Minimum Payments Due 33    
Capital Leases, Future Minimum Payments, Interest Included in Payments 2    
Rent expense $ 196 $ 192  
Total     $ 691,000,000