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Business Combinations (Consideration and Allocation) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 05, 2018	Jan. 30, 2018	Dec. 31, 2018	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Aggregate consideration
Acquisition costs				$ 24		$ 24		$ 24	$ 4
Aggregate fair value of shares issued as partial consideration								$ 2,112
Songa
Aggregate consideration
Newly issued shares (in shares)		66.9						66.9
Business combination consideration (per share)		$ 10.99
Aggregate fair value of shares issued as partial consideration		$ 735						$ 735
Aggregate fair value of Exchangeable Bonds issued		675
Consideration transferred to Songa shareholders		1,410
Total consideration transferred in business combination		1,761
Acquisition price allocation
Cash and cash equivalents		113
Accounts receivable		115
Property and equipment		2,414
Goodwill		462
Drilling contract intangible assets		632
Other current assets		80
Accounts payable and other current liabilities		178
Debt		1,768
Other long-term liabilities		76
Net assets acquired		1,794
Noncontrolling interest in business combination		33
Controlling interest acquired in business combination		1,761
Songa | Senior Unsecured Exchangeable Bonds0.5 Percent Settle Indebtedness [Member]
Aggregate consideration
Aggregate fair value of Exchangeable Bonds issued		$ 351
Ocean Rig
Aggregate consideration
Newly issued shares (in shares)	147.7							147.7
Business combination consideration (per share)	$ 9.32
Aggregate fair value of shares issued as partial consideration	$ 1,377							$ 1,400
Aggregate cash paid as partial consideration	1,168
Total consideration transferred in business combination	2,545
Acquisition price allocation
Cash and cash equivalents	152
Accounts receivable	76
Property and equipment	2,205
Drilling contract intangible assets	275
Other current assets	115
Accounts payable and other current liabilities	71
Construction contract intangible liabilities	132
Other long-term liabilities	54
Net assets acquired	$ 2,566
Bargain purchase gain			$ 10		$ 11		$ 11	$ 10
Cumulative gain on bargain purchase							$ 21

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