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Discontinued Operations (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) $ / shares | Nov. 30, 2012 item
Summarized results of discontinued operations |  |  |  |
Income (loss) from discontinued operations, net of tax |  | $ 2 | $ (20) |
Proceeds from repayment of loans receivable |  | $ 15 | 101 |
Shelf Drilling Holdings, Ltd | Discontinued Operations, Disposed of by Sale |  |  |  |
Summarized results of discontinued operations |  |  |  |
Number of Drilling Units Sold | item |  |  |  | 38
Operating revenues |  |  | 166 |
Operating costs and related losses |  |  | 160 |
Income (loss) from discontinued operations, net of tax |  |  | $ 8 |
Gain (loss) on the sale of assets, per diluted share | $ / shares |  |  | $ (0.02) |
Income tax expense, discontinued operations |  |  | $ 14 |
ADTI | Discontinued Operations, Disposed of by Sale |  |  |  |
Summarized results of discontinued operations |  |  |  |
Proceeds from disposal of discontinued operations, net |  |  | 10 |
Loss on disposal of assets in discontinued operations, net |  |  | $ (12) |
Net loss on sale of assets per diluted share (in dollars per share) | $ / shares |  |  | $ (0.03) |
(Gain) loss on disposal of assets in discontinued operations, tax effect |  |  | $ 0 |
Borrowings outstanding under working capital line of credit to buyer |  |  | $ 15 |
Proceeds from repayment of loans receivable | $ 15 |  |  |

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- Definition Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759 + Details
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