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Drilling Fleet (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |
Total capital expenditures | $ 140 | $ 386
Construction in Progress |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |
Construction work in progress, at beginning of period | 1,392 | 2,171
Total capital expenditures | 140 | 386
Changes in accrued capital additions | (6) | (22)
Construction work in progress acquired in business combination | 26 |
Construction work in progress sold |  | (289)
Construction work in progress, at end of period | 588 | 2,180
New builds |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |
Total capital expenditures | 64 | 299
Property and equipment placed into service | (903) |
Other property and equipment |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |
Total capital expenditures | 76 | 87
Property and equipment placed into service | $ (61) | $ (66)

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