v2.4.0.8

Debt (Details)	0 Months Ended					0 Months Ended			0 Months Ended			1 Months Ended	3 Months Ended	6 Months Ended				0 Months Ended		6 Months Ended																																			0 Months Ended						6 Months Ended						6 Months Ended
	May 31, 2012 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2013 Ultra Deepwater Floater Discoverer Luanda USD ($)	Dec. 31, 2012 Ultra Deepwater Floater Discoverer Luanda USD ($)	Feb. 15, 2013 5% Notes due February 2013 USD ($)	Jun. 30, 2013 5% Notes due February 2013	Dec. 31, 2012 5% Notes due February 2013 USD ($)	Mar. 15, 2013 5.25% Senior Notes due March 2013 USD ($)	Jun. 30, 2013 5.25% Senior Notes due March 2013	Dec. 31, 2012 5.25% Senior Notes due March 2013 USD ($)	Jun. 30, 2013 TPDI Credit Facilities due March 2015 USD ($)	Jun. 30, 2013 TPDI Credit Facilities due March 2015 USD ($)	Jun. 30, 2013 TPDI Credit Facilities due March 2015 USD ($)	Dec. 31, 2012 TPDI Credit Facilities due March 2015 USD ($)	Jun. 30, 2013 4.95% Senior Notes due November 2015 USD ($)	Dec. 31, 2012 4.95% Senior Notes due November 2015 USD ($)	Mar. 06, 2013 Callable Bonds due February 2016 USD ($)	Mar. 06, 2013 Callable Bonds due February 2016 NOK	Jun. 30, 2013 Callable Bonds due February 2016 USD ($)	Dec. 31, 2012 Callable Bonds due February 2016 USD ($)	Mar. 06, 2013 FRN Callable Bonds USD ($)	Mar. 06, 2013 FRN Callable Bonds NOK	Jun. 30, 2013 11% Callable Bonds	Mar. 06, 2013 11% Callable Bonds USD ($)	Mar. 06, 2013 11% Callable Bonds NOK	Jun. 30, 2013 5.05% Senior Notes due December 2016 USD ($)	Dec. 31, 2012 5.05% Senior Notes due December 2016 USD ($)	Jun. 30, 2013 2.5% Senior Notes due October 2017 USD ($)	Dec. 31, 2012 2.5% Senior Notes due October 2017 USD ($)	Jun. 30, 2013 ADDCL Credit Facilities due December 2017 USD ($)	Dec. 31, 2012 ADDCL Credit Facilities due December 2017 USD ($)	Jun. 30, 2013 Eksportfinans Loans due January 2018 USD ($)	Dec. 31, 2012 Eksportfinans Loans due January 2018 USD ($)	Jun. 30, 2013 6.00% Senior Notes due March 2018 USD ($)	Dec. 31, 2012 6.00% Senior Notes due March 2018 USD ($)	Jun. 30, 2013 7.375% Senior Notes due April 2018 USD ($)	Dec. 31, 2012 7.375% Senior Notes due April 2018 USD ($)	Jun. 30, 2013 6.50% Senior Notes due November 2020 USD ($)	Dec. 31, 2012 6.50% Senior Notes due November 2020 USD ($)	Jun. 30, 2013 6.375% Senior Notes due December 2021 USD ($)	Dec. 31, 2012 6.375% Senior Notes due December 2021 USD ($)	Jun. 30, 2013 3.8% Senior Notes due October 2022 USD ($)	Dec. 31, 2012 3.8% Senior Notes due October 2022 USD ($)	Jun. 30, 2013 7.45% Notes due April 2027 USD ($)	Dec. 31, 2012 7.45% Notes due April 2027 USD ($)	Jun. 30, 2013 8% Debentures due April 2027 USD ($)	Dec. 31, 2012 8% Debentures due April 2027 USD ($)	Jun. 30, 2013 7% Notes due June 2028 USD ($)	Dec. 31, 2012 7% Notes due June 2028 USD ($)	Jun. 30, 2013 Capital lease contract due August 2029 USD ($)	Dec. 31, 2012 Capital lease contract due August 2029 USD ($)	Jun. 30, 2013 7.5% Notes due April 2031 USD ($)	Dec. 31, 2012 7.5% Notes due April 2031 USD ($)	Feb. 07, 2013 1.50% Series C Convertible Senior Notes due December 2037 USD ($)	Dec. 31, 2012 1.50% Series C Convertible Senior Notes due December 2037 USD ($)	Jun. 30, 2013 6.80% Senior Notes due March 2038 USD ($)	Dec. 31, 2012 6.80% Senior Notes due March 2038 USD ($)	Jun. 30, 2013 7.35% Senior Notes due December 2041 USD ($)	Dec. 31, 2012 7.35% Senior Notes due December 2041 USD ($)	Jun. 30, 2013 Five Year Revolving Credit Facility USD ($)	Jun. 30, 2013 Five Year Revolving Credit Facility Minimum Facility Fee	Jun. 30, 2013 Five Year Revolving Credit Facility Maximum Facility Fee	Jun. 30, 2013 Three Year Secured Revolving Credit Facility USD ($)	Jun. 30, 2013 Three Year Secured Revolving Credit Facility Deepwater Champion, Discoverer Americas and Discoverer Inspiration USD ($)	Dec. 31, 2012 Three Year Secured Revolving Credit Facility Deepwater Champion, Discoverer Americas and Discoverer Inspiration USD ($)	Jun. 30, 2013 Three Year Secured Revolving Credit Facility Minimum Facility Fee	Jun. 30, 2013 Three Year Secured Revolving Credit Facility Maximum Facility Fee	Jun. 30, 2013 Transocean Ltd. and Subsidiaries USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 5% Notes due February 2013 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 5.25% Senior Notes due March 2013 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries TPDI Credit Facilities due March 2015 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 4.95% Senior Notes due November 2015 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 4.95% Senior Notes due November 2015 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries Callable Bonds due February 2016 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 5.05% Senior Notes due December 2016 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 5.05% Senior Notes due December 2016 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 2.5% Senior Notes due October 2017 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 2.5% Senior Notes due October 2017 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries Eksportfinans Loans due January 2018 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries Eksportfinans Loans due January 2018 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 6.00% Senior Notes due March 2018 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 6.00% Senior Notes due March 2018 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 7.375% Senior Notes due April 2018 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 7.375% Senior Notes due April 2018 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 6.50% Senior Notes due November 2020 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 6.50% Senior Notes due November 2020 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 6.375% Senior Notes due December 2021 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 6.375% Senior Notes due December 2021 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 3.8% Senior Notes due October 2022 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 3.8% Senior Notes due October 2022 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 7.45% Notes due April 2027 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 7.45% Notes due April 2027 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 8% Debentures due April 2027 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 8% Debentures due April 2027 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 7% Notes due June 2028 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 7% Notes due June 2028 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries Capital lease contract due August 2029 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries Capital lease contract due August 2029 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 7.5% Notes due April 2031 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 7.5% Notes due April 2031 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 1.50% Series C Convertible Senior Notes due December 2037 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 6.80% Senior Notes due March 2038 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 6.80% Senior Notes due March 2038 USD ($)	Jun. 30, 2013 Transocean Ltd. and Subsidiaries 7.35% Senior Notes due December 2041 USD ($)	Dec. 31, 2012 Transocean Ltd. and Subsidiaries 7.35% Senior Notes due December 2041 USD ($)	Jun. 30, 2013 Consolidated variable interest entities USD ($)	Dec. 31, 2012 Consolidated variable interest entities USD ($)	Jun. 30, 2013 Consolidated variable interest entities ADDCL Credit Facilities due December 2017 USD ($)	Dec. 31, 2012 Consolidated variable interest entities ADDCL Credit Facilities due December 2017 USD ($)	Jun. 30, 2013 TPDI TPDI Credit Facilities due March 2015 USD ($)	Dec. 31, 2012 TPDI TPDI Credit Facilities due March 2015 USD ($)	Jun. 30, 2013 TPDI TPDI Credit Facilities Senior Term Loan Due March 2015 USD ($)	Jun. 30, 2013 TPDI TPDI Credit Facilities Junior Term Loan Due March 2015 USD ($)	Jun. 30, 2013 TPDI TPDI Credit Facilities Revolving Credit Facility Due March 2015 USD ($)	Dec. 31, 2012 TPDI Uncommitted Credit Facility Established by Subsidiary USD ($)	Jun. 30, 2013 ADDCL ADDCL Credit Facilities Tranche A Due December 2017 USD ($)	Jun. 30, 2013 ADDCL ADDCL Credit Facilities Tranche C Due December 2017 USD ($)	Jun. 30, 2013 ADDCL ADDCL Secondary Loan Facility Due December 2015 USD ($)	Dec. 31, 2012 ADDCL ADDCL Secondary Loan Facility Due December 2015 USD ($)
Long-term debt by current and noncurrent
Total debt		$ 10,799,000,000	$ 12,459,000,000					$ 250,000,000			$ 502,000,000				$ 403,000,000	$ 1,115,000,000	$ 1,118,000,000				$ 282,000,000						$ 999,000,000	$ 999,000,000	$ 748,000,000	$ 748,000,000	$ 178,000,000	$ 191,000,000	$ 661,000,000	$ 797,000,000	$ 998,000,000	$ 998,000,000	$ 247,000,000	$ 247,000,000	$ 900,000,000	$ 899,000,000	$ 1,199,000,000	$ 1,199,000,000	$ 745,000,000	$ 745,000,000	$ 97,000,000	$ 97,000,000	$ 57,000,000	$ 57,000,000	$ 311,000,000	$ 311,000,000	$ 647,000,000	$ 657,000,000	$ 598,000,000	$ 598,000,000		$ 62,000,000	$ 999,000,000	$ 999,000,000	$ 300,000,000	$ 300,000,000									$ 10,621,000,000	$ 12,268,000,000	$ 250,000,000	$ 502,000,000	$ 403,000,000	$ 1,115,000,000	$ 1,118,000,000	$ 282,000,000	$ 999,000,000	$ 999,000,000	$ 748,000,000	$ 748,000,000	$ 661,000,000	$ 797,000,000	$ 998,000,000	$ 998,000,000	$ 247,000,000	$ 247,000,000	$ 900,000,000	$ 899,000,000	$ 1,199,000,000	$ 1,199,000,000	$ 745,000,000	$ 745,000,000	$ 97,000,000	$ 97,000,000	$ 57,000,000	$ 57,000,000	$ 311,000,000	$ 311,000,000	$ 647,000,000	$ 657,000,000	$ 598,000,000	$ 598,000,000	$ 62,000,000	$ 999,000,000	$ 999,000,000	$ 300,000,000	$ 300,000,000	$ 178,000,000	$ 191,000,000	$ 178,000,000	$ 191,000,000
Debt due within one year		191,000,000	1,367,000,000					250,000,000			502,000,000				70,000,000						282,000,000										30,000,000	28,000,000	140,000,000	153,000,000																	21,000,000	20,000,000				62,000,000													161,000,000	1,339,000,000	250,000,000	502,000,000	70,000,000			282,000,000					140,000,000	153,000,000																	21,000,000	20,000,000			62,000,000					30,000,000	28,000,000	30,000,000	28,000,000
Long-term debt		10,608,000,000	11,092,000,000																																																																		10,460,000,000	10,929,000,000																																						148,000,000	163,000,000
Debt instrument interest rate stated percentage							5.00%			5.25%						4.95%								11.00%			5.05%		2.50%						6.00%		7.375%		6.50%		6.375%		3.80%		7.45%		8.00%		7.00%				7.50%				6.80%		7.35%
Percentage ownership interest in Transocean Inc. by Transocean Ltd.																																																																					100.00%
Credit facility term																																																													5 years			3 years
Borrowing capacity, maximum																																																													2,000,000,000			900,000,000																																																1,265,000,000				75,000,000		215,000,000	399,000,000	90,000,000
Weighted-average interest rate (as a percent)																																																																																																																						1.10%		3.40%
Debt instrument face amount																																																																																																																		1,000,000,000	190,000,000
Commitment fee percentage at period end																																																													0.275%	0.125%	0.325%	0.375%			0.125%	0.50%
Credit facility available borrowing capacity																																																													2,000,000,000			900,000,000
Letters of credit issued and outstanding																																																													24,000,000																																																								60,000,000
Aggregate principal amount outstanding		10,793,000,000																				164,000,000	940,000,000		98,000,000	560,000,000																																											10,615,000,000																																							178,000,000
Aggregate commitment of subsidiary in secured term loan												595,000,000	595,000,000	595,000,000
Credit facility amount outstanding																																																													0			0																																																						150,000,000		80,000,000
Debt due to a subsidiary, eliminated in consolidation																																																																																																																							399,000,000	52,000,000
Aggregate principal amount repaid	148,000,000					250,000,000			500,000,000			735,000,000																																											62,000,000
Payment made to a subsidiary out of repayment of debt, eliminated in consolidation												367,000,000
Restricted investments used as security for debt instruments																																	664,000,000	801,000,000																																																																															23,000,000							18,000,000	19,000,000
NOK exchange rate																			5.73
Aggregate cash payment made for debt repurchased																		273,000,000	1,567,000,000
Percentage of total commitment under ADDCL secondary bank credit agreement provided by subsidiary																																																																																																																								65.00%
Aggregate carrying amount assets pledged				753,000,000	786,000,000																																																												2,300,000,000	2,300,000,000
Loss on retirement of debt													$ 1,000,000	$ 1,000,000						$ 1,000,000

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- Definition

The aggregate commitment of a subsidiary in the secured term loan which was established to finance the construction of and is secured by Dhirubhai Deepwater KG1 and Dhirubhai Deepwater KG2.

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The amount outstanding under Credit Facilities or Notes payable which is due to one of the Company's subsidiaries and is eliminated in consolidation.

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Total amount of letters of credit issued and outstanding under the company's primary bank credit facility as of the reporting date.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Gross amount of debt extinguished.

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Amount borrowed under the credit facility as of the balance sheet date.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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