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Debt (Details) $ in Millions								1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
Debt (Details) $ in Millions	Dec. 15, 2016 USD ($)	Dec. 08, 2016 USD ($)	Oct. 19, 2016 USD ($)	Jul. 21, 2016 USD ($)	May 17, 2016	Mar. 19, 2016	Mar. 19, 2015	Jun. 30, 2014 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) subsidiary	Oct. 15, 2016	Aug. 01, 2016 USD ($)	Jun. 15, 2016	Apr. 15, 2016
Principal amount
Total debt, excluding debt-related balances											$ 8,509	$ 8,546	$ 8,509
Debt due within one year											1,094	731	1,094
Long-term debt											7,415	7,815	7,415
Carrying amount
Total debt											8,490	8,464	8,490
Debt due within one year											1,093	724	1,093
Long-term debt											7,397	7,740	7,397
Proceeds from issuance of debt												2,401
Gain (loss) on retirement of debt									$ 110	$ 38	23	$ 148	23	$ (13)
Five-Year Revolving Credit Facility
Carrying amount
Borrowing capacity, maximum								$ 3,000
Credit facility term								5 years
Debt to tangible capitalization ratio								0.6
Spread on variable rate basis (as a percent)					2.00%	1.75%						2.00%
Commitment fee percentage at period end					0.35%		0.275%					0.35%
Credit facility amount outstanding												$ 0
Letters of credit issued and outstanding												0
Credit facility available borrowing capacity												$ 3,000
Five-Year Revolving Credit Facility \| Base Rate
Carrying amount
Percentage reduction to the calculated variable rate												1.00%
Five-Year Revolving Credit Facility \| Minimum
Carrying amount
Commitment fee percentage at period end												0.15%
Five-Year Revolving Credit Facility \| Minimum \| Adjusted LIBOR
Carrying amount
Spread on variable rate basis (as a percent)												1.125%
Five-Year Revolving Credit Facility \| Maximum
Carrying amount
Commitment fee percentage at period end												0.35%
Five-Year Revolving Credit Facility \| Maximum \| Adjusted LIBOR
Carrying amount
Spread on variable rate basis (as a percent)												2.00%
4.95% Senior Notes due November 2015
Carrying amount
Aggregate principal amount repaid													893	207
6.50% Senior Notes due November 2020
Principal amount
Total debt, excluding debt-related balances											900	$ 508	900
Carrying amount
Total debt											911	$ 513	911
Debt instrument interest rate stated percentage												6.50%
Aggregate principal amount repaid												$ 44
Aggregate debt repurchase												$ 348
5.05% Senior Notes due December 2016
Principal amount
Total debt, excluding debt-related balances											975		975
Debt due within one year											975		975
Carrying amount
Total debt											973		973
Debt due within one year											973		973
Debt instrument interest rate stated percentage												5.05%					6.80%
Redemption price of debt instrument (as a percent)	100.00%
Aggregate principal amount repaid	$ 938											$ 36	25
6.375% Senior Notes due December 2021
Principal amount
Total debt, excluding debt-related balances											1,150	552	1,150
Carrying amount
Total debt											1,143	$ 549	1,143
Debt instrument interest rate stated percentage												6.375%					8.125%
Aggregate principal amount repaid												$ 122	50
Aggregate debt repurchase												476
7.35% Senior Notes due December 2041
Principal amount
Total debt, excluding debt-related balances											300	300	300
Carrying amount
Total debt											297	$ 297	297
Debt instrument interest rate stated percentage												7.35%					9.10%
2.50% Senior Notes due October 2017
Principal amount
Total debt, excluding debt-related balances											570	$ 485	570
Debt due within one year												485
Carrying amount
Total debt											568	484	568
Debt due within one year												$ 484
Debt instrument interest rate stated percentage												2.50%			4.25%			3.75%
Aggregate principal amount repaid												$ 85	180
3.80% Senior Notes due October 2022
Principal amount
Total debt, excluding debt-related balances											734	539	734
Carrying amount
Total debt											726	$ 534	726
Debt instrument interest rate stated percentage												3.80%			5.55%			5.05%
Aggregate principal amount repaid												$ 38	16
Aggregate debt repurchase												157
6.00% Senior Notes due March 2018
Principal amount
Total debt, excluding debt-related balances											789	754	789
Carrying amount
Total debt											789	$ 757	789
Debt instrument interest rate stated percentage												6.00%
Aggregate principal amount repaid												$ 35	211
6.80% Senior Notes due March 2038
Principal amount
Total debt, excluding debt-related balances											1,000	1,000	1,000
Carrying amount
Total debt											991	$ 991	991
Debt instrument interest rate stated percentage												6.80%
Eksportfinans Loans due 2018
Principal amount
Total debt, excluding debt-related balances											217	$ 123	217
Debt due within one year											96	98	96
Carrying amount
Total debt											216	123	216
Debt due within one year											97	98	97
7.375% Senior Notes due April 2018
Principal amount
Total debt, excluding debt-related balances											237	211	237
Carrying amount
Total debt											236	$ 211	236
Debt instrument interest rate stated percentage												7.375%
Aggregate principal amount repaid												$ 26	10
9.00% Senior Notes due July 2023
Principal amount
Total debt, excluding debt-related balances												1,250
Carrying amount
Total debt												$ 1,211
Debt instrument interest rate stated percentage												9.00%
Debt instrument face value				$ 1,250
Proceeds from issuance of debt				$ 1,210
Redemption price of debt instrument (as a percent)				100.00%
Senior Secured Notes
Carrying amount
Aggregate carrying amount assets pledged			$ 103									$ 1,700
Aggregate carrying amount assets pledged related to principal			61
Aggregate carrying amount assets pledged related to interest			$ 42
Redemption price of debt instrument (as a percent)			100.00%
Percentage of principal amount that the holder of the note may require the entity to repurchase upon the occurrence of certain events			100.00%
7.75% Senior Notes due October 2024
Principal amount
Total debt, excluding debt-related balances												600
Debt due within one year												60
Carrying amount
Total debt												583
Debt due within one year												$ 57
Debt instrument interest rate stated percentage												7.75%
Maximum Collateral Ratio												5.75
Debt instrument face value			$ 600
Proceeds from issuance of debt			583
Principal payment			$ 30
6.25% Senior Notes due December 2024
Principal amount
Total debt, excluding debt-related balances												$ 625
Debt due within one year												63
Carrying amount
Total debt												609
Debt due within one year												$ 60
Debt instrument interest rate stated percentage												6.25%
Maximum Collateral Ratio												5.75
Debt instrument face value		$ 625
Proceeds from issuance of debt		609
Principal payment		$ 31
7.45% Notes due April 2027
Principal amount
Total debt, excluding debt-related balances											96	$ 88	96
Carrying amount
Total debt											94	$ 86	94
Debt instrument interest rate stated percentage												7.45%
Aggregate principal amount repaid												$ 8	4
8% Debentures due April 2027
Principal amount
Total debt, excluding debt-related balances											57	57	57
Carrying amount
Total debt											57	$ 57	57
Debt instrument interest rate stated percentage												8.00%
7% Notes due June 2028
Principal amount
Total debt, excluding debt-related balances											300	$ 300	300
Carrying amount
Total debt											309	$ 308	309
Debt instrument interest rate stated percentage												7.00%
Capital lease contract due August 2029
Principal amount
Total debt, excluding debt-related balances											591	$ 566	591
Debt due within one year											23	25	23
Carrying amount
Total debt											591	566	591
Debt due within one year											23	25	23
7.50% Notes due April 2031
Principal amount
Total debt, excluding debt-related balances											593	588	593
Carrying amount
Total debt											$ 589	$ 585	589
Debt instrument interest rate stated percentage												7.50%
Aggregate principal amount repaid												$ 5	7
Tendered Notes
Carrying amount
Tender Offer Principal Amount																$ 1,000
Aggregate debt repurchase												981
Aggregate cash payment made for debt redemption												876
Gain (loss) on retirement of debt												104
Debt Redeemed
Carrying amount
Aggregate principal amount repaid												399	1,396	207
Aggregate cash payment made for debt redemption												354	1,372	216
Gain (loss) on retirement of debt												$ 44	$ 23	(9)
Uncommitted Credit Facility Established by Subsidiary
Carrying amount
Aggregate cash payment made for debt redemption														163
Gain (loss) on retirement of debt														$ (4)
Number of wholly-owned subsidiaries which are borrowers of debt instrument \| subsidiary														1
Transocean Ltd. and Subsidiaries
Carrying amount
Percentage ownership interest in Transocean Inc. by Transocean Ltd.												100.00%