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Debt (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 05, 2017 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 7,475 |  | $ 7,475 |  | $ 8,546
Debt due within one year |  |  | 872 |  | 872 |  | 731
Long-term debt |  |  | 6,603 |  | 6,603 |  | 7,815
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 7,390 |  | 7,390 |  | 8,464
Debt due within one year |  |  | 865 |  | 865 |  | 724
Long-term debt |  |  | 6,525 |  | 6,525 |  | 7,740
Proceeds from issuance of debt |  |  |  |  | 403 |  |
Gain (loss) on retirement of debt |  |  | (48) | $ 38 | $ (48) | $ 38 |
Five-Year Revolving Credit Facility |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |
Borrowing capacity, maximum |  | $ 3,000 |  |  |  |  |
Credit facility term |  | 5 years |  |  |  |  |
Debt to tangible capitalization ratio |  | 0.6 |  |  |  |  |
Commitment fee percentage at period end |  |  |  |  | 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 | Adjusted LIBOR |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |
Spread on variable rate basis (as a percent) |  |  |  |  | 2.00% |  |
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% |  |  |  |  |
5.05% Senior Notes due December 2016 |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  | 36 |
2.5% Senior Notes due October 2017 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 152 |  | $ 152 |  | 485
Debt due within one year |  |  | 152 |  | 152 |  | 485
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 152 |  | 152 |  | 484
Debt due within one year |  |  | $ 152 |  | $ 152 |  | 484
Debt instrument interest rate stated percentage |  |  | 2.50% |  | 2.50% |  |
Interest rate, as adjusted (as a percent) |  |  |  |  | 4.50% |  |
Aggregate principal amount repaid |  |  |  |  | $ 62 | 38 |
Aggregate debt repurchase |  |  | $ 271 |  | 271 |  |
Eksportfinans Loans due January 2018 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 76 |  | 76 |  | 123
Debt due within one year |  |  | 76 |  | 76 |  | 98
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 76 |  | 76 |  | 123
Debt due within one year |  |  | 76 |  | 76 |  | 98
6.00% Senior Notes due March 2018 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 319 |  | 319 |  | 754
Debt due within one year |  |  | 319 |  | 319 |  |
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 320 |  | 320 |  | 757
Debt due within one year |  |  | $ 320 |  | $ 320 |  |
Debt instrument interest rate stated percentage |  |  | 6.00% |  | 6.00% |  |
Aggregate principal amount repaid |  |  |  |  | $ 35 | 20 |
Aggregate debt repurchase |  |  | $ 400 |  | 400 |  |
7.375% Senior Notes due April 2018 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 83 |  | 83 |  | 211
Debt due within one year |  |  | 83 |  | 83 |  |
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 83 |  | 83 |  | 211
Debt due within one year |  |  | $ 83 |  | $ 83 |  |
Debt instrument interest rate stated percentage |  |  | 7.375% |  | 7.375% |  |
Aggregate principal amount repaid |  |  |  |  | $ 1 | 26 |
Aggregate debt repurchase |  |  | $ 127 |  | 127 |  |
6.50% Senior Notes due November 2020 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 296 |  | 296 |  | 508
Debt due within one year |  |  | 4 |  | 4 |  |
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 299 |  | 299 |  | 513
Debt due within one year |  |  | $ 4 |  | $ 4 |  |
Debt instrument interest rate stated percentage |  |  | 6.50% |  | 6.50% |  |
Aggregate principal amount repaid |  |  |  |  | $ 9 | 13 |
Aggregate debt repurchase |  |  | $ 203 |  | 203 |  |
6.375% Senior Notes due December 2021 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 334 |  | 334 |  | 552
Debt due within one year |  |  | 2 |  | 2 |  |
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 332 |  | 332 |  | 549
Debt due within one year |  |  | $ 2 |  | $ 2 |  |
Debt instrument interest rate stated percentage |  |  | 6.375% |  | 6.375% |  |
Interest rate, as adjusted (as a percent) |  |  |  |  | 8.375% |  |
Aggregate principal amount repaid |  |  |  |  | $ 7 | 44 |
Aggregate debt repurchase |  |  | $ 211 |  | 211 |  |
5.52% Senior Notes due May 2022 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 410 |  | 410 |  |
Debt due within one year |  |  | 87 |  | 87 |  |
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 403 |  | 403 |  |
Debt due within one year |  |  | $ 85 |  | $ 85 |  |
Debt instrument interest rate stated percentage | 5.52% |  | 5.52% |  | 5.52% |  |
Debt instrument face value | $ 410 |  |  |  |  |  |
Proceeds from issuance of debt | $ 403 |  |  |  |  |  |
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% |  |  |  |  |  |
Aggregate carrying amount assets pledged | $ 105 |  |  |  |  |  |
Aggregate carrying amount assets pledged related to principal | 57 |  |  |  |  |  |
Aggregate carrying amount assets pledged related to interest | 11 |  |  |  |  |  |
Aggregate carrying amount assets pledged related to working capital | $ 37 |  |  |  |  |  |
3.8% Senior Notes due October 2022 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 506 |  | $ 506 |  | 539
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | $ 501 |  | $ 501 |  | 534
Debt instrument interest rate stated percentage |  |  | 3.80% |  | 3.80% |  |
Interest rate, as adjusted (as a percent) |  |  |  |  | 5.80% |  |
Aggregate principal amount repaid |  |  |  |  | $ 33 | 38 |
9.00% Senior Notes due July 2023 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 1,250 |  | 1,250 |  | 1,250
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | $ 1,214 |  | $ 1,214 |  | 1,211
Debt instrument interest rate stated percentage |  |  | 9.00% |  | 9.00% |  |
7.75% Senior Secured Notes due October 2024 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 570 |  | $ 570 |  | 600
Debt due within one year |  |  | 60 |  | 60 |  | 60
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 555 |  | 555 |  | 583
Debt due within one year |  |  | $ 57 |  | $ 57 |  | 57
Debt instrument interest rate stated percentage |  |  | 7.75% |  | 7.75% |  |
6.25% Senior Notes due December 2024 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 594 |  | $ 594 |  | 625
Debt due within one year |  |  | 63 |  | 63 |  | 63
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 579 |  | 579 |  | 609
Debt due within one year |  |  | $ 60 |  | $ 60 |  | 60
Debt instrument interest rate stated percentage |  |  | 6.25% |  | 6.25% |  |
7.45% Notes due April 2027 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 88 |  | $ 88 |  | 88
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | $ 86 |  | $ 86 |  | 86
Debt instrument interest rate stated percentage |  |  | 7.45% |  | 7.45% |  |
Aggregate principal amount repaid |  |  |  |  |  | 8 |
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% |  | 8.00% |  |
7.00% Notes due June 2028 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 300 |  | $ 300 |  | 300
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | $ 308 |  | $ 308 |  | 308
Debt instrument interest rate stated percentage |  |  | 7.00% |  | 7.00% |  |
Capital lease contract due August 2029 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | $ 552 |  | $ 552 |  | 566
Debt due within one year |  |  | 26 |  | 26 |  | 25
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | 552 |  | 552 |  | 566
Debt due within one year |  |  | 26 |  | 26 |  | 25
7.5% Notes due April 2031 |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  | 588 |  | 588 |  | 588
Carrying amount |  |  |  |  |  |  |
Total debt |  |  | $ 585 |  | $ 585 |  | 585
Debt instrument interest rate stated percentage |  |  | 7.50% |  | 7.50% |  |
Aggregate principal amount repaid |  |  |  |  |  | 5 |
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% |  | 6.80% |  |
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% |  | 7.35% |  |
Interest rate, as adjusted (as a percent) |  |  |  |  | 9.35% |  |
Debt Redeemed |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  | $ 147 | 228 |
Gain (loss) on retirement of debt |  |  | $ (1) | $ 38 | (1) | 38 |
Aggregate cash payment made for debt redemption |  |  |  |  | 147 | $ 189 |
Tendered Notes |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |
Gain (loss) on retirement of debt |  |  | (47) |  | (47) |  |
Tender Offer Principal Amount |  |  | 1,500 |  | 1,500 |  |
Aggregate debt repurchase |  |  | $ 1,212 |  | 1,212 |  |
Aggregate cash payment made for debt redemption |  |  |  |  | $ 1,261 |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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