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Debt - Commercial Paper, Credit Facilities and Senior Notes (Details) | 1 Months Ended | 12 Months Ended
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Dec. 31, 2017 USD ($) | Jan. 31, 2017 USD ($) | Aug. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) extension | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes |  |  |  |  |  | $ 1,350,000,000 | $ 175,000,000 | $ 549,000,000
Commercial Paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum aggregate borrowing capacity | $ 3,000,000,000.0 |  |  |  |  | 3,000,000,000.0 |  |
Senior secured hedged inventory facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum aggregate borrowing capacity | 1,900,000,000.0 |  |  |  |  | 1,900,000,000.0 |  |
Committed borrowing capacity | 1,400,000,000.0 |  |  |  |  | $ 1,400,000,000.0 |  |
Number of years by which maturity date of credit facility may be extended |  |  |  |  |  | 1 year |  |
Senior secured hedged inventory facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility extensions available | extension |  |  |  |  |  | 1 |  |
Senior secured hedged inventory facility | Letters of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Committed borrowing capacity | 400,000,000 |  |  |  |  | $ 400,000,000 |  |
Senior unsecured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum aggregate borrowing capacity | 2,100,000,000.0 |  |  |  |  | 2,100,000,000.0 |  |
Committed borrowing capacity | 1,600,000,000.0 |  |  |  |  | $ 1,600,000,000.0 |  |
Number of years by which maturity date of credit facility may be extended |  |  |  |  |  | 1 year |  |
Senior unsecured revolving credit facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility extensions available | extension |  |  |  |  |  | 1 |  |
Senior unsecured 364-day revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Committed borrowing capacity | 1,000,000,000.0 |  |  |  |  | $ 1,000,000,000.0 |  |
Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument face value | 9,000,000,000 |  |  |  |  | $ 9,000,000,000 | $ 10,300,000,000 |
6.13% senior notes due January 2017 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes |  | $ 400,000,000 |  |  |  |  |  |
Debt instrument, interest rate (as a percent) |  | 6.13% |  |  |  |  | 6.13% |
6.50% senior notes due May 2018 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes | $ 600,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 6.50% |  |  |  |  | 6.50% | 6.50% |
8.75% senior notes due May 2019 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes | $ 350,000,000 |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 8.75% |  |  |  |  | 8.75% | 8.75% |
5.88% senior notes due August 2016 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes |  |  | $ 175,000,000 |  |  |  |  |
Debt instrument, interest rate (as a percent) |  |  | 5.88% |  |  |  |  |
5.25% senior notes due June 2015 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
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 Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of senior notes |  |  |  | $ 400,000,000 |  |  |  |
Debt instrument, interest rate (as a percent) |  |  |  | 3.95% |  |  |  |
4.50% senior notes due December 2026 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 4.50% |  |  |  |  | 4.50% | 4.50% |
Offering price percentage |  |  |  |  |  |  | 99.716% |
Debt instrument face value |  |  |  |  |  |  | $ 750,000,000 |
4.65% senior notes due October 2025 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate (as a percent) | 4.65% |  |  |  |  | 4.65% | 4.65% | 4.65%
Offering price percentage |  |  |  |  |  |  |  | 99.846%
Debt instrument face value |  |  |  |  |  |  |  | $ 1,000,000,000
Other income/(expense), net | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on early redemption of senior notes |  |  |  |  |  | $ 40,000,000 |  |
Non-extending Lender | Senior secured hedged inventory facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Committed borrowing capacity | $ 60,000,000 |  |  |  |  | 60,000,000 |  |
Non-extending Lender | Senior unsecured revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Committed borrowing capacity | $ 120,000,000 |  |  |  |  | $ 120,000,000 |  |
Consolidated finance subsidiary co-issuer | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Consolidated subsidiary, ownership interest held by the parent (as a percent) |  |  |  |  |  | 100.00% |  |

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