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Debt (Details) $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2016 USD ($) | Dec. 08, 2016 USD ($) | Oct. 19, 2016 USD ($) | Jul. 21, 2016 USD ($) | May 17, 2016 | Mar. 19, 2016 | Mar. 19, 2015 | Jun. 30, 2014 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) subsidiary | Oct. 15, 2016 | Aug. 01, 2016 USD ($) | Jun. 15, 2016 | Apr. 15, 2016
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | $ 8,509 | $ 8,546 | $ 8,509 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 1,094 | 731 | 1,094 |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 7,415 | 7,815 | 7,415 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 8,490 | 8,464 | 8,490 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 1,093 | 724 | 1,093 |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  | 7,397 | 7,740 | 7,397 |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  | 2,401 |  |  |  |  |  |
Gain (loss) on retirement of debt |  |  |  |  |  |  |  |  | $ 110 | $ 38 | 23 | $ 148 | 23 | $ (13) |  |  |  |
Five-Year Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Credit facility term |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Debt to tangible capitalization ratio |  |  |  |  |  |  |  | 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 |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Credit facility available borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |
Five-Year Revolving Credit Facility | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
4.95% Senior Notes due November 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  |  | 893 | 207 |  |  |  |
6.50% Senior Notes due November 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 900 | $ 508 | 900 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 911 | $ 513 | 911 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 44 |  |  |  |  |  |
Aggregate debt repurchase |  |  |  |  |  |  |  |  |  |  |  | $ 348 |  |  |  |  |  |
5.05% Senior Notes due December 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 975 |  | 975 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 975 |  | 975 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 973 |  | 973 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 973 |  | 973 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 5.05% |  |  |  |  | 6.80% |
Redemption price of debt instrument (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount repaid | $ 938 |  |  |  |  |  |  |  |  |  |  | $ 36 | 25 |  |  |  |  |
6.375% Senior Notes due December 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 1,150 | 552 | 1,150 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 1,143 | $ 549 | 1,143 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 6.375% |  |  |  |  | 8.125% |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 122 | 50 |  |  |  |  |
Aggregate debt repurchase |  |  |  |  |  |  |  |  |  |  |  | 476 |  |  |  |  |  |
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% |  |  |  |  | 9.10% |
2.50% Senior Notes due October 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 570 | $ 485 | 570 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | 485 |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 568 | 484 | 568 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | $ 484 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  | 4.25% |  |  | 3.75%
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 85 | 180 |  |  |  |  |
3.80% Senior Notes due October 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 734 | 539 | 734 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 726 | $ 534 | 726 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 3.80% |  |  | 5.55% |  |  | 5.05%
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 38 | 16 |  |  |  |  |
Aggregate debt repurchase |  |  |  |  |  |  |  |  |  |  |  | 157 |  |  |  |  |  |
6.00% Senior Notes due March 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 789 | 754 | 789 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 789 | $ 757 | 789 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 35 | 211 |  |  |  |  |
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% |  |  |  |  |  |
Eksportfinans Loans due 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 217 | $ 123 | 217 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 96 | 98 | 96 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 216 | 123 | 216 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 97 | 98 | 97 |  |  |  |  |
7.375% Senior Notes due April 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 237 | 211 | 237 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 236 | $ 211 | 236 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 26 | 10 |  |  |  |  |
9.00% Senior Notes due July 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  | $ 1,211 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying amount assets pledged |  |  | $ 103 |  |  |  |  |  |  |  |  | $ 1,700 |  |  |  |  |  |
Aggregate carrying amount assets pledged related to principal |  |  | 61 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying amount assets pledged related to interest |  |  | $ 42 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.75% Senior Notes due October 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  |  | 600 |  |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | 60 |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  | 583 |  |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | $ 57 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 7.75% |  |  |  |  |  |
Maximum Collateral Ratio |  |  |  |  |  |  |  |  |  |  |  | 5.75 |  |  |  |  |  |
Debt instrument face value |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | 583 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payment |  |  | $ 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
6.25% Senior Notes due December 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  |  | $ 625 |  |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | 63 |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  |  | 609 |  |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  |  | $ 60 |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |  |
Maximum Collateral Ratio |  |  |  |  |  |  |  |  |  |  |  | 5.75 |  |  |  |  |  |
Debt instrument face value |  | $ 625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | 609 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payment |  | $ 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
7.45% Notes due April 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 96 | $ 88 | 96 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 94 | $ 86 | 94 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 7.45% |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 8 | 4 |  |  |  |  |
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% |  |  |  |  |  |
7% Notes due June 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 300 | $ 300 | 300 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 309 | $ 308 | 309 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |
Capital lease contract due August 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 591 | $ 566 | 591 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 23 | 25 | 23 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | 591 | 566 | 591 |  |  |  |  |
Debt due within one year |  |  |  |  |  |  |  |  |  |  | 23 | 25 | 23 |  |  |  |  |
7.50% Notes due April 2031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt, excluding debt-related balances |  |  |  |  |  |  |  |  |  |  | 593 | 588 | 593 |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total debt |  |  |  |  |  |  |  |  |  |  | $ 589 | $ 585 | 589 |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | $ 5 | 7 |  |  |  |  |
Tendered Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender Offer Principal Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |
Aggregate debt repurchase |  |  |  |  |  |  |  |  |  |  |  | 981 |  |  |  |  |  |
Aggregate cash payment made for debt redemption |  |  |  |  |  |  |  |  |  |  |  | 876 |  |  |  |  |  |
Gain (loss) on retirement of debt |  |  |  |  |  |  |  |  |  |  |  | 104 |  |  |  |  |  |
Debt Redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount repaid |  |  |  |  |  |  |  |  |  |  |  | 399 | 1,396 | 207 |  |  |  |
Aggregate cash payment made for debt redemption |  |  |  |  |  |  |  |  |  |  |  | 354 | 1,372 | 216 |  |  |  |
Gain (loss) on retirement of debt |  |  |  |  |  |  |  |  |  |  |  | $ 44 | $ 23 | (9) |  |  |  |
Uncommitted Credit Facility Established by Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payment made for debt redemption |  |  |  |  |  |  |  |  |  |  |  |  |  | 163 |  |  |  |
Gain (loss) on retirement of debt |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (4) |  |  |  |
Number of wholly-owned subsidiaries which are borrowers of debt instrument | subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Transocean Ltd. and Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership interest in Transocean Inc. by Transocean Ltd. |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |

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