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Impairments (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets held for sale |  |  |  |  |  |
Aggregate loss on impairment of assets held for sale |  |  |  | $ 41 | $ 700 |
Assets held and used |  |  |  |  |  |
Loss associated with impairment | $ 52 | $ 668 | $ 507 |  |  |
Impairment of certain corporate assets |  |  |  |  | 52 |
Goodwill, Impaired [Abstract] |  |  |  |  |  |
Goodwill impairment loss |  |  |  |  |  | $ 3,000
Loss on impairment of goodwill, tax effect |  |  |  |  |  | 0
Loss on impairment of goodwill attributable to controlling interest |  |  |  |  |  | $ 2,900
Loss on impairment of goodwill attributable to controlling interest per diluted share |  |  |  |  |  | $ 8.02
Loss on impairment of goodwill per diluted share from continuing operations |  |  |  |  |  | $ 8.02
Loss on impairment of goodwill attributable to noncontrolling interest |  |  |  |  |  | $ 74
Deepwater Floater asset group |  |  |  |  |  |
Assets held and used |  |  |  |  |  |
Loss associated with impairment |  |  |  | $ 52 | 507 | 788
Loss associated with impairment, net of tax |  |  |  |  | $ 481 | $ 693
Loss associated with impairment per diluted share |  |  |  | $ 0.14 | $ 1.31 | $ 1.91
Midwater Floater asset group |  |  |  |  |  |
Assets held and used |  |  |  |  |  |
Loss associated with impairment |  |  |  |  | $ 668 |
Loss associated with impairment, net of tax |  |  |  |  | $ 654 |
Loss associated with impairment per diluted share |  |  |  |  | $ 1.78 |
Construction in Progress |  |  |  |  |  |
Assets held and used |  |  |  |  |  |
Loss associated with impairment |  |  |  |  | $ 52 |
Construction in Progress | Deepwater Floater asset group |  |  |  |  |  |
Assets held and used |  |  |  |  |  |
Impairment of certain corporate assets |  |  |  |  | 41 |
Construction in Progress | Midwater Floater asset group |  |  |  |  |  |
Assets held and used |  |  |  |  |  |
Impairment of certain corporate assets |  |  |  |  | 11 |
Rig sales | Assets held for sale |  |  |  |  |  |
Assets held for sale |  |  |  |  |  |
Aggregate loss on impairment of assets held for sale |  |  |  | $ 41 | 700 | $ 268
Aggregate loss on impairment of assets held for sale, net of tax |  |  |  | $ 39 | $ 585 | $ 221
Aggregate loss on impairment of assets per diluted share |  |  |  | $ 0.10 | $ 1.60 | $ 0.60

X
- Definition Represents the amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized, attributable to controlling interest. + References No definition available. + Details
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