v2.4.0.8

Postemployment Benefit Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value of plan assets
Total investments	$ 1,597	$ 1,370	$ 1,120
Transocean Plans
Fair value of plan assets
Total investments	1,597	1,370
Transocean Plans | Significant observable inputs
Fair value of plan assets
Total investments	1,114	947
Transocean Plans | Significant other observable inputs
Fair value of plan assets
Total investments	483	423
Transocean Plans | Mutual funds
Fair value of plan assets
Total investments	1,446	1,225
Transocean Plans | Mutual funds | Significant observable inputs
Fair value of plan assets
Total investments	1,108	941
Transocean Plans | Mutual funds | Significant other observable inputs
Fair value of plan assets
Total investments	338	284
Transocean Plans | U.S. equity funds
Fair value of plan assets
Total investments	653	557
Transocean Plans | U.S. equity funds | Significant observable inputs
Fair value of plan assets
Total investments	610	525
Transocean Plans | U.S. equity funds | Significant other observable inputs
Fair value of plan assets
Total investments	43	32
Transocean Plans | Non-U.S. equity funds
Fair value of plan assets
Total investments	353	299
Transocean Plans | Non-U.S. equity funds | Significant observable inputs
Fair value of plan assets
Total investments	141	120
Transocean Plans | Non-U.S. equity funds | Significant other observable inputs
Fair value of plan assets
Total investments	212	179
Transocean Plans | Bond funds
Fair value of plan assets
Total investments	440	369
Transocean Plans | Bond funds | Significant observable inputs
Fair value of plan assets
Total investments	357	296
Transocean Plans | Bond funds | Significant other observable inputs
Fair value of plan assets
Total investments	83	73
Transocean Plans | Other investments
Fair value of plan assets
Total investments	151	145
Transocean Plans | Other investments | Significant observable inputs
Fair value of plan assets
Total investments	6	6
Transocean Plans | Other investments | Significant other observable inputs
Fair value of plan assets
Total investments	145	139
Transocean Plans | Cash and money market funds
Fair value of plan assets
Total investments	6	12
Transocean Plans | Cash and money market funds | Significant observable inputs
Fair value of plan assets
Total investments	6	6
Transocean Plans | Cash and money market funds | Significant other observable inputs
Fair value of plan assets
Total investments		6
Transocean Plans | Property collective trusts
Fair value of plan assets
Total investments	15	8
Transocean Plans | Property collective trusts | Significant other observable inputs
Fair value of plan assets
Total investments	15	8
Transocean Plans | Investment contracts
Fair value of plan assets
Total investments	130	125
Transocean Plans | Investment contracts | Significant other observable inputs
Fair value of plan assets
Total investments	130	125
U.S. Plans
Weighted-average target allocations of the investments
Total target allocation percentage	100.00%	100.00%
Total actual allocation percentage	100.00%	100.00%
Fair value of plan assets
Total investments	1,116	948	769
U.S. Plans | Significant observable inputs
Fair value of plan assets
Total investments	1,113	945
U.S. Plans | Significant other observable inputs
Fair value of plan assets
Total investments	3	3
U.S. Plans | Mutual funds
Fair value of plan assets
Total investments	1,111	944
U.S. Plans | Mutual funds | Significant observable inputs
Fair value of plan assets
Total investments	1,108	941
U.S. Plans | Mutual funds | Significant other observable inputs
Fair value of plan assets
Total investments	3	3
U.S. Plans | U.S. equity funds
Fair value of plan assets
Total investments	610	525
U.S. Plans | U.S. equity funds | Significant observable inputs
Fair value of plan assets
Total investments	610	525
U.S. Plans | Non-U.S. equity funds
Fair value of plan assets
Total investments	144	123
U.S. Plans | Non-U.S. equity funds | Significant observable inputs
Fair value of plan assets
Total investments	141	120
U.S. Plans | Non-U.S. equity funds | Significant other observable inputs
Fair value of plan assets
Total investments	3	3
U.S. Plans | Bond funds
Fair value of plan assets
Total investments	357	296
U.S. Plans | Bond funds | Significant observable inputs
Fair value of plan assets
Total investments	357	296
U.S. Plans | Investment grade fixed income
Weighted-average target allocations of the investments
Total target allocation percentage	37.00%	35.00%
Total actual allocation percentage	32.00%	36.00%
U.S. Plans | Other investments
Fair value of plan assets
Total investments	5	4
U.S. Plans | Other investments | Significant observable inputs
Fair value of plan assets
Total investments	5	4
U.S. Plans | Cash and money market funds
Fair value of plan assets
Total investments	5	4
U.S. Plans | Cash and money market funds | Significant observable inputs
Fair value of plan assets
Total investments	5	4
U.S. Plans | Equity securities
Weighted-average target allocations of the investments
Total target allocation percentage	63.00%	65.00%
Total actual allocation percentage	68.00%	64.00%
Non-U.S. Plans
Weighted-average target allocations of the investments
Total target allocation percentage	100.00%	100.00%
Total actual allocation percentage	100.00%	100.00%
Fair value of plan assets
Total investments	481	422	351
Non-U.S. Plans | Significant observable inputs
Fair value of plan assets
Total investments	1	2
Non-U.S. Plans | Significant other observable inputs
Fair value of plan assets
Total investments	480	420
Non-U.S. Plans | Mutual funds
Fair value of plan assets
Total investments	335	281
Non-U.S. Plans | Mutual funds | Significant other observable inputs
Fair value of plan assets
Total investments	335	281
Non-U.S. Plans | U.S. equity funds
Fair value of plan assets
Total investments	43	32
Non-U.S. Plans | U.S. equity funds | Significant other observable inputs
Fair value of plan assets
Total investments	43	32
Non-U.S. Plans | Non-U.S. equity funds
Fair value of plan assets
Total investments	209	176
Non-U.S. Plans | Non-U.S. equity funds | Significant other observable inputs
Fair value of plan assets
Total investments	209	176
Non-U.S. Plans | Bond funds
Fair value of plan assets
Total investments	83	73
Non-U.S. Plans | Bond funds | Significant other observable inputs
Fair value of plan assets
Total investments	83	73
Non-U.S. Plans | Investment grade fixed income
Weighted-average target allocations of the investments
Total target allocation percentage	15.00%	14.00%
Total actual allocation percentage	17.00%	17.00%
Non-U.S. Plans | Other investments
Weighted-average target allocations of the investments
Total target allocation percentage	34.00%	37.00%
Total actual allocation percentage	30.00%	34.00%
Fair value of plan assets
Total investments	146	141
Non-U.S. Plans | Other investments | Significant observable inputs
Fair value of plan assets
Total investments	1	2
Non-U.S. Plans | Other investments | Significant other observable inputs
Fair value of plan assets
Total investments	145	139
Non-U.S. Plans | Cash and money market funds
Fair value of plan assets
Total investments	1	8
Non-U.S. Plans | Cash and money market funds | Significant observable inputs
Fair value of plan assets
Total investments	1	2
Non-U.S. Plans | Cash and money market funds | Significant other observable inputs
Fair value of plan assets
Total investments		6
Non-U.S. Plans | Property collective trusts
Fair value of plan assets
Total investments	15	8
Non-U.S. Plans | Property collective trusts | Significant other observable inputs
Fair value of plan assets
Total investments	15	8
Non-U.S. Plans | Investment contracts
Fair value of plan assets
Total investments	130	125
Non-U.S. Plans | Investment contracts | Significant other observable inputs
Fair value of plan assets
Total investments	$ 130	$ 125
Non-U.S. Plans | Equity securities
Weighted-average target allocations of the investments
Total target allocation percentage	51.00%	49.00%
Total actual allocation percentage	53.00%	49.00%

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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