Derivatives - Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 |
Gross and net fair values of outstanding derivatives (in millions) | | |
Collateral received netted against derivative assets | $ 6 | $ 4 |
Collateral paid netted against derivative liabilities | 1 | 13 |
Collateral deposited with clearinghouses and brokers | 25 | 25 |
Cash-flow hedges | Commodity contracts | Other current assets | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Total net fair value, asset | | 1 |
Cash-flow hedges | Commodity contracts | Accrued liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Total net fair value, liability | | 6 |
Cash-flow hedges | Level 2 | Commodity contracts | Other current assets | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative asset, gross | | 1 |
Cash-flow hedges | Level 2 | Commodity contracts | Accrued liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative liability, gross | | 6 |
Not designated as hedging instruments | Commodity contracts | Other current assets | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Total net fair value, asset | 23 | 27 |
Netting, asset | (308) | (196) |
Not designated as hedging instruments | Commodity contracts | Long-term receivables and other assets, net | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Total net fair value, asset | 3 | 3 |
Netting, asset | (3) | (2) |
Not designated as hedging instruments | Commodity contracts | Accrued liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Netting and collateral, liability | (308) | (196) |
Total net fair value, liability | 8 | 27 |
Not designated as hedging instruments | Commodity contracts | Deferred credits and other liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Netting and collateral, liability | (3) | (2) |
Total net fair value, liability | 6 | 5 |
Not designated as hedging instruments | Level 1 | Commodity contracts | Other current assets | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative asset, gross | 285 | 166 |
Not designated as hedging instruments | Level 1 | Commodity contracts | Long-term receivables and other assets, net | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative asset, gross | 4 | 2 |
Not designated as hedging instruments | Level 1 | Commodity contracts | Accrued liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative liability, gross | 282 | 172 |
Not designated as hedging instruments | Level 1 | Commodity contracts | Deferred credits and other liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative liability, gross | 3 | 1 |
Not designated as hedging instruments | Level 2 | Commodity contracts | Other current assets | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative asset, gross | 46 | 57 |
Not designated as hedging instruments | Level 2 | Commodity contracts | Long-term receivables and other assets, net | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative asset, gross | 2 | 3 |
Not designated as hedging instruments | Level 2 | Commodity contracts | Accrued liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative liability, gross | 34 | 51 |
Not designated as hedging instruments | Level 2 | Commodity contracts | Deferred credits and other liabilities | | |
Gross and net fair values of outstanding derivatives (in millions) | | |
Commodity contract derivative liability, gross | $ 6 | $ 6 |