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Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based compensation expense |  |  |
Share-based compensation expense | $ 42 | $ 64 | $ 98
Income tax benefit on share-based compensation expense | 7 | 11 | 15
Capitalized interest |  |  |
Capitalized interest costs on construction work in progress | 176 | 140 | 133
Foreign currency |  |  |
Net foreign currency exchange gain (loss) | (2) |  | $ 18
Cash and cash equivalents |  |  |
Restricted cash investments | 510 | 467 |
Restricted cash investments classified in other current assets | 466 | 340 |
Restricted cash investments classified in other assets | 44 | 127 |
Accounts receivable |  |  |
Allowance for doubtful accounts | 1 | 1 |
Materials and supplies |  |  |
Materials and supplies, allowance for obsolescence | 153 | 148 |
Assets held for sale |  |  |
Assets held for sale, included in other current assets | $ 6 | 8 |
Property and equipment |  |  |
Property and equipment as a percentage of total assets | 78.00% |  |
Maximum |  |  |
Foreign currency |  |  |
Net foreign currency exchange gain (loss) |  | $ 1 |
Drilling rig units | Minimum |  |  |
Property and equipment |  |  |
Estimated original useful life | 20 years |  |
Drilling rig units | Maximum |  |  |
Property and equipment |  |  |
Estimated original useful life | 35 years |  |
Buildings and improvements | Minimum |  |  |
Property and equipment |  |  |
Estimated original useful life | 2 years |  |
Buildings and improvements | Maximum |  |  |
Property and equipment |  |  |
Estimated original useful life | 30 years |  |
Machinery and equipment | Minimum |  |  |
Property and equipment |  |  |
Estimated original useful life | 4 years |  |
Machinery and equipment | Maximum |  |  |
Property and equipment |  |  |
Estimated original useful life | 20 years |  |

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