Represents the debt to tangible capitalization ratio.

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Gross amount of debt extinguished.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Debt (Details) $ in Millions					3 Months Ended		9 Months Ended
Debt (Details) $ in Millions	Aug. 01, 2016 USD ($)	Jul. 21, 2016 USD ($)	May 17, 2016	May 16, 2016	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Oct. 15, 2016	Jun. 15, 2016	Apr. 15, 2016	Dec. 31, 2015 USD ($)	Jun. 30, 2014 USD ($)
Long-term debt by current and noncurrent
Total debt					$ 8,260		$ 8,260					$ 8,490
Debt due within one year					1,069		1,069					1,093
Long-term debt					7,191		7,191					7,397
Gain on retirement of debt					$ 110	$ 7	148	$ 7
Proceeds from issuance of debt							$ 1,210
Five-Year Revolving Credit Facility
Long-term debt by current and noncurrent
Borrowing capacity, maximum													$ 3,000
Credit facility term							5 years
Debt to tangible capitalization ratio					0.6		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		$ 0
Letters of credit issued and outstanding					0		0
Credit facility available borrowing capacity					$ 3,000		$ 3,000
Five-Year Revolving Credit Facility \| Base Rate
Long-term debt by current and noncurrent
Percentage reduction to the calculated variable rate					1.00%		1.00%
Five-Year Revolving Credit Facility \| Minimum
Long-term debt by current and noncurrent
Commitment fee percentage at period end							0.15%
Five-Year Revolving Credit Facility \| Minimum \| Adjusted LIBOR
Long-term debt by current and noncurrent
Spread on variable rate basis (as a percent)							1.125%
Five-Year Revolving Credit Facility \| Maximum
Long-term debt by current and noncurrent
Commitment fee percentage at period end							0.35%
Five-Year Revolving Credit Facility \| Maximum \| Adjusted LIBOR
Long-term debt by current and noncurrent
Spread on variable rate basis (as a percent)							2.00%
4.95% Senior Notes due November 2015
Long-term debt by current and noncurrent
Aggregate principal amount repaid								893
Aggregate cash payment made for debt redemption								904
6.50% Senior Notes due November 2020
Long-term debt by current and noncurrent
Total debt					$ 525		$ 525					911
Debt instrument interest rate stated percentage	6.50%				6.50%		6.50%
Aggregate principal amount repaid	$ 348						$ 32
5.05% Senior Notes due December 2016
Long-term debt by current and noncurrent
Total debt					$ 938		938					973
Debt due within one year					$ 938		$ 938					973
Debt instrument interest rate stated percentage					5.05%		5.05%			6.80%
Aggregate principal amount repaid							$ 36	5
6.375% Senior Notes due December 2021
Long-term debt by current and noncurrent
Total debt					$ 551		$ 551					1,143
Debt instrument interest rate stated percentage	6.375%				6.375%		6.375%			8.125%
Aggregate principal amount repaid	$ 476						$ 120	30
7.35% Senior Notes due December 2041
Long-term debt by current and noncurrent
Total debt					$ 297		$ 297					297
Debt instrument interest rate stated percentage					7.35%		7.35%			9.10%
2.5% Senior Notes due October 2017
Long-term debt by current and noncurrent
Total debt					$ 504		$ 504					568
Debt instrument interest rate stated percentage					2.50%		2.50%		4.25%		3.75%
Aggregate principal amount repaid							$ 65	107
3.8% Senior Notes due October 2022
Long-term debt by current and noncurrent
Total debt					$ 534		$ 534					726
Debt instrument interest rate stated percentage	3.80%				3.80%		3.80%		5.55%		5.05%
Aggregate principal amount repaid	$ 157						$ 38	16
6.00% Senior Notes due March 2018
Long-term debt by current and noncurrent
Total debt					$ 759		$ 759					789
Debt instrument interest rate stated percentage					6.00%		6.00%
Aggregate principal amount repaid							$ 35	134
6.80% Senior Notes due March 2038
Long-term debt by current and noncurrent
Total debt					$ 991		$ 991					991
Debt instrument interest rate stated percentage					6.80%		6.80%
Eksportfinans Loans due 2018
Long-term debt by current and noncurrent
Total debt					$ 133		$ 133					216
Debt due within one year					106		106					97
7.375% Senior Notes due April 2018
Long-term debt by current and noncurrent
Total debt					$ 211		$ 211					236
Debt instrument interest rate stated percentage					7.375%		7.375%
Aggregate principal amount repaid							$ 26
9.00% Senior Notes due July 2023
Long-term debt by current and noncurrent
Total debt					$ 1,210		$ 1,210
Debt instrument interest rate stated percentage		9.00%			9.00%		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%
7.45% Notes due April 2027
Long-term debt by current and noncurrent
Total debt					$ 85		$ 85					94
Debt instrument interest rate stated percentage					7.45%		7.45%
Aggregate principal amount repaid							$ 8
8% Debentures due April 2027
Long-term debt by current and noncurrent
Total debt					$ 57		$ 57					57
Debt instrument interest rate stated percentage					8.00%		8.00%
7% Notes due June 2028
Long-term debt by current and noncurrent
Total debt					$ 308		$ 308					309
Debt instrument interest rate stated percentage					7.00%		7.00%
Capital lease contract due August 2029
Long-term debt by current and noncurrent
Total debt					$ 572		$ 572					591
Debt due within one year					25		25					23
7.5% Notes due April 2031
Long-term debt by current and noncurrent
Total debt					$ 585		$ 585					$ 589
Debt instrument interest rate stated percentage					7.50%		7.50%
Aggregate principal amount repaid							$ 5
Tendered Notes
Long-term debt by current and noncurrent
Tender Offer Principal Amount	$ 1,000
Aggregate cash payment made for debt redemption					$ 876		876
Gain on retirement of debt					104		104
Debt Redeemed
Long-term debt by current and noncurrent
Aggregate principal amount repaid					137	292	365	292
Aggregate cash payment made for debt redemption					131	274	320	274
Gain on retirement of debt					$ 6	$ 7	$ 44	$ 7
Transocean Inc.
Long-term debt by current and noncurrent
Percentage ownership interest in Transocean Inc. by Transocean Ltd.							100.00%