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Debt - Components (Details) - USD ($) | Dec. 31, 2016 | Aug. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Short-term debt: |  |  |  |
Total short-term debt | $ 1,715,000,000 |  | $ 999,000,000 |
Long-term debt: |  |  |  |
Senior notes, net of unamortized discounts and debt issuance costs | 9,874,000,000 |  | 9,698,000,000 |
Noncurrent portion of other long-term debt | 250,000,000 |  | 677,000,000 |
Total long-term debt | 10,124,000,000 |  | 10,375,000,000 |
Total debt | 11,839,000,000 |  | 11,374,000,000 |
Senior notes |  |  |  |
Long-term debt: |  |  |  |
Unamortized discounts and debt issuance costs | (76,000,000) |  | (77,000,000) |
Senior notes, net of unamortized discounts and debt issuance costs | 9,874,000,000 |  | 9,698,000,000 |
Debt instrument face value | 10,300,000,000 |  | 9,800,000,000 |
Other |  |  |  |
Long-term debt: |  |  |  |
Noncurrent portion of other long-term debt | 3,000,000 |  | 5,000,000 |
Commercial Paper |  |  |  |
Short-term debt: |  |  |  |
Short-term notes and borrowings | $ 563,000,000 |  | $ 696,000,000 |
Weighted average interest rate, short-term (as a percent) | 1.60% |  | 1.10% |
Other |  |  |  |
Short-term debt: |  |  |  |
Other debt, current portion | $ 2,000,000 |  | $ 3,000,000 |
Level 2 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Debt instrument fair value | 10,400,000,000 |  | 8,600,000,000 |
5.88% senior notes due August 2016 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs |  |  | $ 175,000,000 |
Debt instrument, interest rate (as a percent) |  | 5.88% | 5.88% |
6.13% senior notes due January 2017 | Senior notes |  |  |  |
Short-term debt: |  |  |  |
Senior notes, current portion | $ 400,000,000 |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs |  |  | $ 400,000,000 |
Debt instrument, interest rate (as a percent) | 6.13% |  | 6.13% |
6.50% senior notes due May 2018 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 600,000,000 |  | $ 600,000,000 |
Debt instrument, interest rate (as a percent) | 6.50% |  | 6.50% |
8.75% senior notes due May 2019 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 350,000,000 |  | $ 350,000,000 |
Debt instrument, interest rate (as a percent) | 8.75% |  | 8.75% |
2.60% senior notes due December 2019 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 500,000,000 |  | $ 500,000,000 |
Debt instrument, interest rate (as a percent) | 2.60% |  | 2.60% | 2.60%
Debt instrument face value |  |  |  | $ 500,000,000
5.75% senior notes due January 2020 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 500,000,000 |  | $ 500,000,000 |
Debt instrument, interest rate (as a percent) | 5.75% |  | 5.75% |
5.00% senior notes due February 2021 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 600,000,000 |  | $ 600,000,000 |
Debt instrument, interest rate (as a percent) | 5.00% |  | 5.00% |
3.65% senior notes due June 2022 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 750,000,000 |  | $ 750,000,000 |
Debt instrument, interest rate (as a percent) | 3.65% |  | 3.65% |
2.85% senior notes due January 2023 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 400,000,000 |  | $ 400,000,000 |
Debt instrument, interest rate (as a percent) | 2.85% |  | 2.85% |
3.85% senior notes due October 2023 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 700,000,000 |  | $ 700,000,000 |
Debt instrument, interest rate (as a percent) | 3.85% |  | 3.85% |
3.60% senior notes due November 2024 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 750,000,000 |  | $ 750,000,000 |
Debt instrument, interest rate (as a percent) | 3.60% |  | 3.60% | 3.60%
Debt instrument face value |  |  |  | $ 750,000,000
4.65% senior notes due October 2025 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 1,000,000,000 |  | $ 1,000,000,000 |
Debt instrument, interest rate (as a percent) | 4.65% |  | 4.65% |
Debt instrument face value |  |  | $ 1,000,000,000 |
4.50% senior notes due December 2026 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 750,000,000 |  | 0 |
Debt instrument, interest rate (as a percent) | 4.50% |  |  |
Debt instrument face value | $ 750,000,000 |  |  |
6.70% senior notes due May 2036 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 250,000,000 |  | $ 250,000,000 |
Debt instrument, interest rate (as a percent) | 6.70% |  | 6.70% |
6.65% senior notes due January 2037 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 600,000,000 |  | $ 600,000,000 |
Debt instrument, interest rate (as a percent) | 6.65% |  | 6.65% |
5.15% senior notes due June 2042 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 500,000,000 |  | $ 500,000,000 |
Debt instrument, interest rate (as a percent) | 5.15% |  | 5.15% |
4.30% senior notes due January 2043 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 350,000,000 |  | $ 350,000,000 |
Debt instrument, interest rate (as a percent) | 4.30% |  | 4.30% |
4.70% senior notes due June 2044 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 700,000,000 |  | $ 700,000,000 |
Debt instrument, interest rate (as a percent) | 4.70% |  | 4.70% | 4.70%
Debt instrument face value |  |  |  | $ 700,000,000
4.90% senior notes due February 2045 | Senior notes |  |  |  |
Long-term debt: |  |  |  |
Long-term debt, before deducting unamortized discounts and debt issuance costs | $ 650,000,000 |  | $ 650,000,000 |
Debt instrument, interest rate (as a percent) | 4.90% |  | 4.90% | 4.90%
Debt instrument face value |  |  |  | $ 650,000,000
Commercial Paper |  |  |  |
Long-term debt: |  |  |  |
Noncurrent portion of other long-term debt | $ 247,000,000 |  | $ 672,000,000 |
Weighted average interest rate, long-term (as a percent) | 1.60% |  | 1.10% |
Senior secured hedged inventory facility | Line of Credit |  |  |  |
Short-term debt: |  |  |  |
Short-term notes and borrowings | $ 750,000,000 |  | $ 300,000,000 |
Weighted average interest rate, short-term (as a percent) | 1.80% |  | 1.40% |
Exchange Traded |  |  |  |
Short-term debt: |  |  |  |
Total short-term debt | $ 410,000,000 |  |  |

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