Noncontrolling Interest (Details) $ in Millions			1 Months Ended	12 Months Ended
	Dec. 09, 2016 shares	Aug. 05, 2014 shares	Jul. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2016	Nov. 04, 2015 USD ($)
Noncontrolling interest
Distribution to holders of noncontrolling interest				$ 30	$ 29	$ 5
Total number of securities issued in merger | shares	1.20
Total number of securities issued in merger | shares	23,800,000
TDSOI
Noncontrolling interest
Increase (decrease) in amount			$ 12
Ownership interest held by minority interest (as a percent)							30.00%
Cash payment for repurchase of noncontrolling interest			$ 2
Unit repurchase program
Noncontrolling interest
Authorized repurchase amount								$ 40
Transocean Partners
Noncontrolling interest
Common units offered in initial public offering | shares		20,100,000
Common units held by parent | shares		21,300,000
Subordinated units held by parent | shares		27,600,000
Percentage of limited liability company interest held by parent		70.8
Net cash proceeds from offering						417
Underwriting discounts, commissions and offering costs						26
Dividends				99	100	15
Distribution to holders of noncontrolling interest				$ 28	29	4
Shares repurchased (in shares) | shares				478,376
Value of shares repurchased				$ 4
Noncontrolling interest
Noncontrolling interest
Increase (decrease) in amount				$ 18	$ (9)	(33)
Noncontrolling interest | Transocean Partners
Noncontrolling interest
Increase (decrease) in amount						$ 44