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Drilling Fleet (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Construction work in progress, at beginning of period   $ 2,171 $ 3,735
Total capital expenditures   258 826
Changes in accrued capital additions   (23) (90)
Construction in progress sold   (289)  
Construction work in progress, at end of period $ 2,070 2,070 2,634
Assets held and used      
Loss associated with impairment $ 96 $ 96  
Loss associated with impairment per diluted share $ 0.25 $ 0.25  
Loss associated with impairment, tax effect $ 0 $ 0  
New builds      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   200 740
Property and equipment placed into service     (1,672)
Other construction projects and capital additions      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Total capital expenditures   58 86
Other property and equipment      
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest      
Property and equipment placed into service   $ (47) $ (165)