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Supplemental Cash Flow Information (Details) - USD ($) shares in Millions, $ in Millions			12 Months Ended
	Dec. 05, 2018	Jan. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in other operating assets and liabilities
Decrease in accounts receivable			$ 87	$ 180	$ 230
(Increase) decrease in other assets			(30)	3	(37)
Decrease in accounts payable and other current liabilities			(21)	(154)	(115)
(Decrease) increase in other long-term liabilities			(34)	80	(13)
Change in income taxes receivable / payable, net			(303)	125	(58)
Change in receivables from / payables to affiliates, net			(10)
Net change in operating assets and liabilities			(311)	234	7
Certain cash operating activities
Cash payments for interest			648	570	486
Cash payments for income taxes			121	151	124
Non-cash investing and financing activities
Capital additions, accrued at end of period			$ 48	30	$ 20
Issuance of shares in business combinations				2,112
Issuance of debt in business combination				1,026
Songa
Non-cash investing and financing activities
Issuance of shares in business combinations		$ 735		$ 735
Newly issued shares (in shares)		66.9		66.9
Convertible debt				$ 854
Ocean Rig
Non-cash investing and financing activities
Issuance of shares in business combinations	$ 1,377			$ 1,400
Newly issued shares (in shares)	147.7			147.7

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