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Commitments and Contingencies - Unconditional Purchase Obligations, Warranties and Guarantees (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Unconditional Purchase Obligations    
Due in 2019 $ 244  
Due in 2020 216  
Due in 2021 131  
Due in 2022 40  
Due in 2023 15  
Due after 2023 17  
Total unconditional purchase obligation commitment 663  
Warranties/Guarantees:    
Accrued product warranty liabilities $ 48 $ 50