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Debt - Commercial Paper, Credit Facilities and Senior Notes (Details) | 1 Months Ended | 12 Months Ended
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Jan. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt |  |  |  |  |  |  |
Repayments of senior notes |  |  |  |  | $ 175,000,000 | $ 549,000,000 | $ 0
Commercial Paper |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum aggregate borrowing capacity |  |  |  |  | 3,000,000,000.0 |  |
Senior secured hedged inventory facility |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum aggregate borrowing capacity |  |  |  |  | 1,900,000,000.0 |  |
Committed borrowing capacity |  |  |  |  | $ 1,400,000,000.0 |  |
Basis for variable interest rate |  |  |  |  | Eurocurrency Rate or the Base Rate |  |
Number of years by which maturity date of credit facility may be extended |  |  |  |  | 1 year |  |
Senior secured hedged inventory facility | Minimum |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Credit facility extensions available | item |  |  |  |  | 1 |  |
Senior secured hedged inventory facility | Letters of credit |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Committed borrowing capacity |  |  |  |  | $ 400,000,000 |  |
Senior unsecured revolving credit facility |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum aggregate borrowing capacity |  |  |  |  | 2,100,000,000.0 |  |
Committed borrowing capacity |  |  |  |  | $ 1,600,000,000 |  |
Basis for variable interest rate |  |  |  |  | Eurocurrency Rate, the Base Rate or the Canadian Prime Rate |  |
Number of years by which maturity date of credit facility may be extended |  |  |  |  | 1 year |  |
Senior unsecured revolving credit facility | Minimum |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Credit facility extensions available | item |  |  |  |  | 1 |  |
Senior unsecured 364-day revolving credit facility |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Committed borrowing capacity |  |  |  |  | $ 1,000,000,000 |  |
Basis for variable interest rate |  |  |  |  | Eurocurrency Rate or the Base Rate |  |
Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument face value |  |  |  |  | $ 10,300,000,000 | $ 9,800,000,000 |
Senior notes | Consolidated finance subsidiary co-issuer |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Consolidated subsidiary, ownership interest held by the parent (as a percent) |  |  |  |  | 100.00% |  |
4.50% senior notes due December 2026 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 4.50% |  |
Debt instrument face value |  |  |  |  | $ 750,000,000 |  |
4.65% senior notes due October 2025 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 4.65% | 4.65% |
Public offering price (as a percent) |  |  |  |  |  | 99.846% |
Debt instrument face value |  |  |  |  |  | $ 1,000,000,000 |
2.60% senior notes due December 2019 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 2.60% | 2.60% | 2.60%
Public offering price (as a percent) |  |  |  |  |  |  | 99.813%
Debt instrument face value |  |  |  |  |  |  | $ 500,000,000
4.90% senior notes due February 2045 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 4.90% | 4.90% | 4.90%
Public offering price (as a percent) |  |  |  |  |  |  | 99.876%
Debt instrument face value |  |  |  |  |  |  | $ 650,000,000
3.60% senior notes due November 2024 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 3.60% | 3.60% | 3.60%
Public offering price (as a percent) |  |  |  |  |  |  | 99.842%
Debt instrument face value |  |  |  |  |  |  | $ 750,000,000
4.70% senior notes due June 2044 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 4.70% | 4.70% | 4.70%
Public offering price (as a percent) |  |  |  |  |  |  | 99.734%
Debt instrument face value |  |  |  |  |  |  | $ 700,000,000
5.88% senior notes due August 2016 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Repayments of senior notes |  | $ 175,000,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 5.88% |  |  |  | 5.88% |
6.13% senior notes due January 2017 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  |  | 6.13% | 6.13% |
5.25% senior notes due June 2015 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Repayments of senior notes |  |  |  | $ 150,000,000 |  |  |
Debt instrument, interest rate (as a percent) |  |  |  | 5.25% |  |  |
3.95% senior notes due September 2015 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Repayments of senior notes |  |  | $ 400,000,000 |  |  |  |
Debt instrument, interest rate (as a percent) |  |  | 3.95% |  |  |  |
Non-extending Lender | Senior secured hedged inventory facility |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Committed borrowing capacity |  |  |  |  | $ 126,300,000 |  |
Non-extending Lender | Senior unsecured revolving credit facility |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Committed borrowing capacity |  |  |  |  | $ 140,000,000 |  |
Subsequent Event | 6.13% senior notes due January 2017 | Senior notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Repayments of senior notes | $ 400,000,000 |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 6.13% |  |  |  |  |  |

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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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