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Debt (Details)
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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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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May 31, 2012
USD ($)
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Jun. 30, 2013
USD ($)
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Dec. 31, 2012
USD ($)
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Jun. 30, 2013
Ultra Deepwater Floater Discoverer Luanda
USD ($)
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Dec. 31, 2012
Ultra Deepwater Floater Discoverer Luanda
USD ($)
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Feb. 15, 2013
5% Notes due February 2013
USD ($)
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Jun. 30, 2013
5% Notes due February 2013
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Dec. 31, 2012
5% Notes due February 2013
USD ($)
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Mar. 15, 2013
5.25% Senior Notes due March 2013
USD ($)
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Jun. 30, 2013
5.25% Senior Notes due March 2013
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Dec. 31, 2012
5.25% Senior Notes due March 2013
USD ($)
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Jun. 30, 2013
TPDI Credit Facilities due March 2015
USD ($)
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Jun. 30, 2013
TPDI Credit Facilities due March 2015
USD ($)
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Jun. 30, 2013
TPDI Credit Facilities due March 2015
USD ($)
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Dec. 31, 2012
TPDI Credit Facilities due March 2015
USD ($)
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Jun. 30, 2013
4.95% Senior Notes due November 2015
USD ($)
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Dec. 31, 2012
4.95% Senior Notes due November 2015
USD ($)
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Mar. 06, 2013
Callable Bonds due February 2016
USD ($)
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Mar. 06, 2013
Callable Bonds due February 2016
NOK
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Jun. 30, 2013
Callable Bonds due February 2016
USD ($)
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Dec. 31, 2012
Callable Bonds due February 2016
USD ($)
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Mar. 06, 2013
FRN Callable Bonds
USD ($)
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Mar. 06, 2013
FRN Callable Bonds
NOK
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Jun. 30, 2013
11% Callable Bonds
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Mar. 06, 2013
11% Callable Bonds
USD ($)
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Mar. 06, 2013
11% Callable Bonds
NOK
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Jun. 30, 2013
5.05% Senior Notes due December 2016
USD ($)
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Dec. 31, 2012
5.05% Senior Notes due December 2016
USD ($)
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Jun. 30, 2013
2.5% Senior Notes due October 2017
USD ($)
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Dec. 31, 2012
2.5% Senior Notes due October 2017
USD ($)
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Jun. 30, 2013
ADDCL Credit Facilities due December 2017
USD ($)
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Dec. 31, 2012
ADDCL Credit Facilities due December 2017
USD ($)
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Jun. 30, 2013
Eksportfinans Loans due January 2018
USD ($)
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Dec. 31, 2012
Eksportfinans Loans due January 2018
USD ($)
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Jun. 30, 2013
6.00% Senior Notes due March 2018
USD ($)
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Dec. 31, 2012
6.00% Senior Notes due March 2018
USD ($)
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Jun. 30, 2013
7.375% Senior Notes due April 2018
USD ($)
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Dec. 31, 2012
7.375% Senior Notes due April 2018
USD ($)
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Jun. 30, 2013
6.50% Senior Notes due November 2020
USD ($)
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Dec. 31, 2012
6.50% Senior Notes due November 2020
USD ($)
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Jun. 30, 2013
6.375% Senior Notes due December 2021
USD ($)
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Dec. 31, 2012
6.375% Senior Notes due December 2021
USD ($)
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Jun. 30, 2013
3.8% Senior Notes due October 2022
USD ($)
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Dec. 31, 2012
3.8% Senior Notes due October 2022
USD ($)
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Jun. 30, 2013
7.45% Notes due April 2027
USD ($)
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Dec. 31, 2012
7.45% Notes due April 2027
USD ($)
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Jun. 30, 2013
8% Debentures due April 2027
USD ($)
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Dec. 31, 2012
8% Debentures due April 2027
USD ($)
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Jun. 30, 2013
7% Notes due June 2028
USD ($)
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Dec. 31, 2012
7% Notes due June 2028
USD ($)
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Jun. 30, 2013
Capital lease contract due August 2029
USD ($)
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Dec. 31, 2012
Capital lease contract due August 2029
USD ($)
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Jun. 30, 2013
7.5% Notes due April 2031
USD ($)
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Dec. 31, 2012
7.5% Notes due April 2031
USD ($)
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Feb. 07, 2013
1.50% Series C Convertible Senior Notes due December 2037
USD ($)
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Dec. 31, 2012
1.50% Series C Convertible Senior Notes due December 2037
USD ($)
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Jun. 30, 2013
6.80% Senior Notes due March 2038
USD ($)
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Dec. 31, 2012
6.80% Senior Notes due March 2038
USD ($)
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Jun. 30, 2013
7.35% Senior Notes due December 2041
USD ($)
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Dec. 31, 2012
7.35% Senior Notes due December 2041
USD ($)
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Jun. 30, 2013
Five Year Revolving Credit Facility
USD ($)
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Jun. 30, 2013
Five Year Revolving Credit Facility
Minimum Facility Fee
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Jun. 30, 2013
Five Year Revolving Credit Facility
Maximum Facility Fee
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Jun. 30, 2013
Three Year Secured Revolving Credit Facility
USD ($)
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Jun. 30, 2013
Three Year Secured Revolving Credit Facility
Deepwater Champion, Discoverer Americas and Discoverer Inspiration
USD ($)
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Dec. 31, 2012
Three Year Secured Revolving Credit Facility
Deepwater Champion, Discoverer Americas and Discoverer Inspiration
USD ($)
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Jun. 30, 2013
Three Year Secured Revolving Credit Facility
Minimum Facility Fee
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Jun. 30, 2013
Three Year Secured Revolving Credit Facility
Maximum Facility Fee
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
5% Notes due February 2013
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
5.25% Senior Notes due March 2013
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
TPDI Credit Facilities due March 2015
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
4.95% Senior Notes due November 2015
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
4.95% Senior Notes due November 2015
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
Callable Bonds due February 2016
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
5.05% Senior Notes due December 2016
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
5.05% Senior Notes due December 2016
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
2.5% Senior Notes due October 2017
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
2.5% Senior Notes due October 2017
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
Eksportfinans Loans due January 2018
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
Eksportfinans Loans due January 2018
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
6.00% Senior Notes due March 2018
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
6.00% Senior Notes due March 2018
USD ($)
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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 ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
6.50% Senior Notes due November 2020
USD ($)
|
Jun. 30, 2013
Transocean Ltd. and Subsidiaries
6.375% Senior Notes due December 2021
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
6.375% Senior Notes due December 2021
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
3.8% Senior Notes due October 2022
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
3.8% Senior Notes due October 2022
USD ($)
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Jun. 30, 2013
Transocean Ltd. and Subsidiaries
7.45% Notes due April 2027
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
7.45% Notes due April 2027
USD ($)
|
Jun. 30, 2013
Transocean Ltd. and Subsidiaries
8% Debentures due April 2027
USD ($)
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Dec. 31, 2012
Transocean Ltd. and Subsidiaries
8% Debentures due April 2027
USD ($)
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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 ($)
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Jun. 30, 2013
TPDI
TPDI Credit Facilities due March 2015
USD ($)
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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 ($)
|
Jun. 30, 2013
TPDI
TPDI Credit Facilities Revolving Credit Facility Due March 2015
USD ($)
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Dec. 31, 2012
TPDI
Uncommitted Credit Facility Established by Subsidiary
USD ($)
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Jun. 30, 2013
ADDCL
ADDCL Credit Facilities Tranche A Due December 2017
USD ($)
|
Jun. 30, 2013
ADDCL
ADDCL Credit Facilities Tranche C Due December 2017
USD ($)
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Jun. 30, 2013
ADDCL
ADDCL Secondary Loan Facility Due December 2015
USD ($)
|
Dec. 31, 2012
ADDCL
ADDCL Secondary Loan Facility Due December 2015
USD ($)
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| 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 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||