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Drilling Fleet (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | $ 3,735 | $ 2,447 | $ 2,708
Total capital expenditures | 1,344 | 2,001 | 2,165
Changes in accrued capital additions | (86) | (11) | (45)
Impairment of construction work in progress |  | (52) |
Construction work in progress, at end of period | 2,171 | 3,735 | 2,447
New builds |  |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |  |
Total capital expenditures | 1,206 | 1,622 | 1,436
Property and equipment placed into service | (2,557) |  | (1,522)
Other equipment and construction projects |  |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |  |
Total capital expenditures | 138 | 379 | 729
Other property and equipment |  |  |
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest |  |  |
Property and equipment placed into service | $ (265) | $ (650) | $ (859)

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