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Derivatives and Fair Value of Financial Instruments - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Derivatives and Fair Value of Financial Instruments |  |
Transfers that occurred into or out of level 1 | $ 0 | $ 0
Transfers that occurred into or out of level 2 | 0 | 0
Transfers that occurred into or out of level 3 | 0 | 0
Commodities |  |
Assets: |  |
Margin account | 29 | 4
Other accrued liabilities | Commodities |  |
Liabilities: |  |
Derivatives |  | 1
Money market funds |  |
Assets: |  |
Available-for-sale securities | 81 | 142
Corporate bonds |  |
Assets: |  |
Available-for-sale securities |  | 11
U.S. Government agency securities |  |
Assets: |  |
Available-for-sale securities |  | 10
Other available-for-sale securities |  |
Assets: |  |
Available-for-sale securities |  | 4
Domestic equity securities |  |
Assets: |  |
Trading securities | 466 | 115
Domestic debt securities |  |
Assets: |  |
Trading securities | 450 | 5
Foreign equity securities |  |
Assets: |  |
Trading securities | 120 |
High yield trading debt securities |  |
Assets: |  |
Trading securities | 104 | 182
Money market funds held in trading accounts |  |
Assets: |  |
Trading securities | 22 | 21
Fair Value |  |
Assets: |  |
Available-for-sale securities | 81 | 167
Trading securities | 1,173 | 324
Recurring basis | Fair Value |  |
Assets: |  |
Total Assets | 1,309 | 546
Liabilities: |  |
Liabilities | 24 | 10
Recurring basis | Fair Value | Commodities |  |
Assets: |  |
Derivatives | 4 | 6
Margin account | 29 | 4
Derivative assets and liabilities, net basis | 15 | 9
Liabilities: |  |
Derivatives | 18 | 2
Recurring basis | Fair Value | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 6 | 8
Recurring basis | Fair Value | Foreign currencies |  |
Assets: |  |
Derivatives | 8 | 1
Recurring basis | Fair Value | Money market funds | Short-term investments. |  |
Assets: |  |
Available-for-sale securities | 81 | 142
Recurring basis | Fair Value | Corporate bonds | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 11
Recurring basis | Fair Value | U.S. Government agency securities | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 10
Recurring basis | Fair Value | Other available-for-sale securities | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 4
Recurring basis | Fair Value | Domestic equity securities | Short-term investments. |  |
Assets: |  |
Trading securities | 466 | 115
Recurring basis | Fair Value | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 31 | 34
Recurring basis | Fair Value | Domestic debt securities | Short-term investments. |  |
Assets: |  |
Trading securities | 450 | 5
Recurring basis | Fair Value | Foreign equity securities | Short-term investments. |  |
Assets: |  |
Trading securities | 120 |
Recurring basis | Fair Value | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 5 | 7
Recurring basis | Fair Value | High yield trading debt securities | Short-term investments. |  |
Assets: |  |
Trading securities | 104 | 182
Recurring basis | Fair Value | Money market funds held in trading accounts | Short-term investments. |  |
Assets: |  |
Trading securities | 22 | 21
Recurring basis | Fair Value | Collateralized loan obligations | Short-term investments. |  |
Assets: |  |
Trading securities | 10 |
Recurring basis | Fair Value | Other trading securities | Short-term investments. |  |
Assets: |  |
Trading securities | 1 | 1
Recurring basis | Fair Value | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4 | 5
Recurring basis | Fair Value | Other | Other current assets |  |
Assets: |  |
Trading securities | 3 | 2
Recurring basis | Level 1 |  |
Assets: |  |
Total Assets | 1,185 | 335
Liabilities: |  |
Liabilities | 18 | 2
Recurring basis | Level 1 | Commodities |  |
Assets: |  |
Derivatives | 4 | 6
Liabilities: |  |
Derivatives | 18 | 2
Recurring basis | Level 1 | Money market funds | Short-term investments. |  |
Assets: |  |
Available-for-sale securities | 81 | 142
Recurring basis | Level 1 | Domestic equity securities | Short-term investments. |  |
Assets: |  |
Trading securities | 466 | 115
Recurring basis | Level 1 | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 31 | 34
Recurring basis | Level 1 | Domestic debt securities | Short-term investments. |  |
Assets: |  |
Trading securities | 450 | 3
Recurring basis | Level 1 | Foreign equity securities | Short-term investments. |  |
Assets: |  |
Trading securities | 120 |
Recurring basis | Level 1 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 5 | 7
Recurring basis | Level 1 | Money market funds held in trading accounts | Short-term investments. |  |
Assets: |  |
Trading securities | 22 | 21
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 4 | 5
Recurring basis | Level 1 | Other | Other current assets |  |
Assets: |  |
Trading securities | 2 | 2
Recurring basis | Level 2 |  |
Assets: |  |
Total Assets | 124 | 211
Liabilities: |  |
Liabilities | 6 | 8
Recurring basis | Level 2 | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 6 | 8
Recurring basis | Level 2 | Foreign currencies |  |
Assets: |  |
Derivatives | 8 | 1
Recurring basis | Level 2 | Corporate bonds | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 11
Recurring basis | Level 2 | U.S. Government agency securities | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 10
Recurring basis | Level 2 | Other available-for-sale securities | Short-term investments. |  |
Assets: |  |
Available-for-sale securities |  | 4
Recurring basis | Level 2 | Domestic debt securities | Short-term investments. |  |
Assets: |  |
Trading securities |  | 2
Recurring basis | Level 2 | High yield trading debt securities | Short-term investments. |  |
Assets: |  |
Trading securities | 104 | 182
Recurring basis | Level 2 | Collateralized loan obligations | Short-term investments. |  |
Assets: |  |
Trading securities | 10 |
Recurring basis | Level 2 | Other trading securities | Short-term investments. |  |
Assets: |  |
Trading securities | 1 | $ 1
Recurring basis | Level 2 | Other | Other current assets |  |
Assets: |  |
Trading securities | $ 1 |

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