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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, 2016 | Dec. 31, 2015
Assets and liabilities measured at fair value on a recurring basis and also its level within the fair value hierarchy |  |
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 | 10 | 29
Money market funds |  |
Assets: |  |
Available-for-sale securities |  | 81
Domestic equity securities |  |
Assets: |  |
Trading securities | 482 | 466
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries |  |
Assets: |  |
Trading securities | 437 | 450
Foreign equity securities |  |
Assets: |  |
Trading securities | 199 | 120
High yield securities |  |
Assets: |  |
Trading securities | 115 | 104
Money market funds held in trading accounts |  |
Assets: |  |
Trading securities | 13 | 22
Fair Value |  |
Assets: |  |
Available-for-sale securities |  | 81
Trading securities | 1,277 | 1,173
Recurring basis | Fair Value |  |
Assets: |  |
Total Assets | 1,321 | 1,309
Liabilities: |  |
Liabilities | 9 | 24
Recurring basis | Fair Value | Commodities |  |
Assets: |  |
Derivatives | 3 | 4
Margin account | 10 | 29
Derivative assets and liabilities, net basis | 12 | 15
Liabilities: |  |
Derivatives | 1 | 18
Recurring basis | Fair Value | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 4 | 6
Recurring basis | Fair Value | Foreign currencies |  |
Assets: |  |
Derivatives | 1 | 8
Liabilities: |  |
Derivatives | 4 |
Recurring basis | Fair Value | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 81
Recurring basis | Fair Value | Domestic equity securities | Short-term investments |  |
Assets: |  |
Trading securities | 482 | 466
Recurring basis | Fair Value | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 30 | 31
Recurring basis | Fair Value | Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Short-term investments |  |
Assets: |  |
Trading securities | 437 | 450
Recurring basis | Fair Value | Foreign equity securities | Short-term investments |  |
Assets: |  |
Trading securities | 199 | 120
Recurring basis | Fair Value | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 3 | 5
Recurring basis | Fair Value | High yield securities | Short-term investments |  |
Assets: |  |
Trading securities | 115 | 104
Recurring basis | Fair Value | Collateralized loan obligations | Short-term investments |  |
Assets: |  |
Trading securities | 26 | 10
Recurring basis | Fair Value | Money market funds held in trading accounts | Short-term investments |  |
Assets: |  |
Trading securities | 13 | 22
Recurring basis | Fair Value | Other trading investments | Short-term investments |  |
Assets: |  |
Trading securities | 5 | 1
Recurring basis | Fair Value | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 3 | 4
Recurring basis | Fair Value | Other | Other current assets |  |
Assets: |  |
Trading securities | 4 | 3
Recurring basis | Level 1 |  |
Assets: |  |
Total Assets | 1,194 | 1,185
Liabilities: |  |
Liabilities | 1 | 18
Recurring basis | Level 1 | Commodities |  |
Assets: |  |
Derivatives | 3 | 4
Liabilities: |  |
Derivatives | 1 | 18
Recurring basis | Level 1 | Money market funds | Short-term investments |  |
Assets: |  |
Available-for-sale securities |  | 81
Recurring basis | Level 1 | Domestic equity securities | Short-term investments |  |
Assets: |  |
Trading securities | 482 | 466
Recurring basis | Level 1 | Domestic equity securities | Other current assets |  |
Assets: |  |
Trading securities | 30 | 31
Recurring basis | Level 1 | Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Short-term investments |  |
Assets: |  |
Trading securities | 437 | 450
Recurring basis | Level 1 | Foreign equity securities | Short-term investments |  |
Assets: |  |
Trading securities | 199 | 120
Recurring basis | Level 1 | Foreign equity securities | Other current assets |  |
Assets: |  |
Trading securities | 3 | 5
Recurring basis | Level 1 | High yield securities | Short-term investments |  |
Assets: |  |
Trading securities | 15 |
Recurring basis | Level 1 | Money market funds held in trading accounts | Short-term investments |  |
Assets: |  |
Trading securities | 13 | 22
Recurring basis | Level 1 | Other trading investments | Short-term investments |  |
Assets: |  |
Trading securities | 5 |
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets |  |
Assets: |  |
Trading securities | 3 | 4
Recurring basis | Level 1 | Other | Other current assets |  |
Assets: |  |
Trading securities | 4 | 2
Recurring basis | Level 2 |  |
Assets: |  |
Total Assets | 127 | 124
Liabilities: |  |
Liabilities | 8 | 6
Recurring basis | Level 2 | Interest rate swaps |  |
Liabilities: |  |
Derivatives | 4 | 6
Recurring basis | Level 2 | Foreign currencies |  |
Assets: |  |
Derivatives | 1 | 8
Liabilities: |  |
Derivatives | 4 |
Recurring basis | Level 2 | High yield securities | Short-term investments |  |
Assets: |  |
Trading securities | 100 | 104
Recurring basis | Level 2 | Collateralized loan obligations | Short-term investments |  |
Assets: |  |
Trading securities | $ 26 | 10
Recurring basis | Level 2 | Other trading investments | Short-term investments |  |
Assets: |  |
Trading securities |  | 1
Recurring basis | Level 2 | Other | Other current assets |  |
Assets: |  |
Trading securities |  | $ 1

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