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Goodwill and Other Intangibles (Amortization) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Intangibles      
Recognition of contract intangible revenues   $ 187 $ 112
2020 $ 190 190  
2021 190 190  
2022 171 171  
2023 52 52  
2024 5 5  
Total carrying amount of contract intangible assets 608 608 795
Intangible liabilities      
Construction contract intangible liabilities     $ 132
Gain on termination of construction contracts $ 132 $ 132  
Ultra-deepwater floaters      
Intangible liabilities      
Number of mobile offshore drilling units under construction | item 2 2