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Business Combinations (Intangibles) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Intangibles    
Recognition of contract intangible revenues $ 29 $ 78
Total carrying amount of contract intangible assets 554 554
Contract intangible revenues    
Intangibles    
2019 117 117
2020 117 117
2021 117 117
2022 117 117
2023 74 74
Thereafter 12 12
Total carrying amount of contract intangible assets 554 554
Songa    
Intangibles    
Total carrying amount of contract intangible assets $ 554 $ 554