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Impairments (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Assets held and used |  |  |  |
Impairment of certain corporate assets |  |  |  | $ 52
Deepwater Floater asset group |  |  |  |
Assets held and used |  |  |  |
Loss associated with impairment |  |  |  | 507
Loss associated with impairment, net of tax |  |  |  | $ 481
Loss associated with impairment per diluted share |  |  |  | $ 1.32
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 |  |  |  | $ 1.79
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 | $ 11 | $ 13 | $ 34 | 664
Aggregate loss on impairment of assets held for sale, net of tax |  |  | $ 31 | $ 550
Aggregate loss on impairment of assets per diluted share | $ 0.03 | $ 0.03 | $ 0.08 | $ 1.50

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