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Drilling Fleet (Impairment held for sale) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets held for sale |  |  |  |  |
Aggregate loss on impairment of assets held for sale |  |  | $ 578 |  |
Loss associated with impairment, net of tax (per share) |  |  | $ 0.94 |  |
Aggregate loss on impairment of assets held for sale, tax effect |  |  | $ 0 |  |
Rig sales |  |  |  |  |
Assets held for sale |  |  |  |  |
Aggregate loss on impairment of assets held for sale | $ 583 | $ 999 |  | $ 999 | $ 1,400
Loss associated with impairment, net of tax (per share) |  |  |  | $ 2.13 | $ 3.59
Aggregate loss on impairment of assets held for sale, tax effect |  |  |  | $ 0 | $ 0

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- Definition Represents the tax effect of impairments recognized during the period for long-lived assets held in continuing operations for abandonment, exchange or sale. + References No definition available. + Details
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- Definition After tax earnings per share or per unit impact arising from asset impairment. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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- Details
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