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Commitments and Contingencies, Purchase Obligations (Details) - USD ($)
$ in Billions
Jun. 30, 2019
Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]    
Unrecorded purchase obligation, in total $ 13.0 $ 10.8
New Purchase Obligations [Member]    
Unrecorded Unconditional Purchase Obligation [Line Items]    
Unrecorded purchase obligation, next five years 1.3  
Thereafter 2.3  
Unrecorded purchase obligation, in total $ 3.6