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v3.19.3.a.u2

Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill |  |  |  |
Loss on impairment of goodwill | $ 462 |  | $ 462 |
Loss on impairment of goodwill, tax effect |  |  | 0 |
Contract intangibles |  |  |  |
Contract intangible assets |  | $ 608 | 795 |
Capitalized interest |  |  |  |
Capitalized interest costs on construction work in progress |  | 38 | 37 | $ 116
Functional currency |  |  |  |
Net foreign currency exchange gain (loss) |  | 2 | (38) | $ (6)
Materials and supplies |  |  |  |
Materials and supplies, allowance for obsolescence |  | 127 | 134 |
Restricted cash accounts and investments |  |  |  |
Restricted cash investment |  | 558 | 552 |
Restricted cash investments classified as current |  | 558 | 551 |
Restricted cash investments classified in other assets |  |  | 1 |
Assets held for sale |  |  |  |
Assets held for sale, included in other current assets |  | $ 0 | $ 25 |
Property and equipment |  |  |  |
Property and equipment as a percentage of total assets |  | 78.00% |  |
Drilling rig units | Minimum |  |  |  |
Property and equipment |  |  |  |
Estimated original useful life |  | 30 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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