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Derivatives and Fair Value of Financial Instruments-Deferred Comp Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
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  
Transfers that occurred into or out of level 2 0  
Transfers that occurred into or out of level 3 0  
Commodities    
Assets:    
Margin account 23 $ 20
Domestic equity securities    
Assets:    
Fair Value Equity 744 752
Foreign equity securities    
Assets:    
Fair Value Equity 320 319
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries    
Assets:    
Trading securities 135 439
Collateralized loan obligation    
Assets:    
Trading securities 28 29
High yield securities    
Assets:    
Trading securities 21 21
Money market funds held in trading accounts    
Assets:    
Trading securities 8 10
Other trading securities    
Assets:    
Trading securities 8 6
Recurring basis | Fair Value    
Assets:    
Total Assets 1,315 1,629
Liabilities:    
Liabilities 12 12
Recurring basis | Fair Value | Commodities    
Assets:    
Derivatives 5 4
Margin account 23 20
Liabilities:    
Derivatives 11 6
Recurring basis | Fair Value | Foreign currencies    
Assets:    
Derivatives   3
Liabilities:    
Derivatives 1 6
Recurring basis | Fair Value | Other current assets | Commodities    
Assets:    
Derivative assets and liabilities, net basis 17 18
Recurring basis | Fair Value | Domestic equity securities | Short term investments    
Assets:    
Trading securities   752
Fair Value Equity 744  
Recurring basis | Fair Value | Domestic equity securities | Other current assets    
Assets:    
Trading securities   35
Fair Value Equity 34  
Recurring basis | Fair Value | Foreign equity securities | Short term investments    
Assets:    
Trading securities   319
Fair Value Equity 320  
Recurring basis | Fair Value | Foreign equity securities | Other current assets    
Assets:    
Trading securities   4
Fair Value Equity 4  
Recurring basis | Fair Value | Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Short term investments    
Assets:    
Trading securities 135 439
Recurring basis | Fair Value | Collateralized loan obligation | Short term investments    
Assets:    
Trading securities 28 29
Recurring basis | Fair Value | High yield securities | Short term investments    
Assets:    
Trading securities 21 21
Recurring basis | Fair Value | Money market funds held in trading accounts | Short term investments    
Assets:    
Trading securities 8 10
Recurring basis | Fair Value | Money market funds held in trading accounts | Other current assets    
Assets:    
Trading securities 5 5
Recurring basis | Fair Value | Other trading securities | Short term investments    
Assets:    
Trading securities 8 6
Recurring basis | Fair Value | Fixed income mutual funds | Other current assets    
Assets:    
Trading securities 3 2
Recurring basis | Level 1    
Assets:    
Total Assets 1,260 1,596
Liabilities:    
Liabilities 11 6
Recurring basis | Level 1 | Commodities    
Assets:    
Derivatives 5 4
Liabilities:    
Derivatives 11 6
Recurring basis | Level 1 | Domestic equity securities | Short term investments    
Assets:    
Trading securities   752
Fair Value Equity 744  
Recurring basis | Level 1 | Domestic equity securities | Other current assets    
Assets:    
Trading securities   35
Fair Value Equity 34  
Recurring basis | Level 1 | Foreign equity securities | Short term investments    
Assets:    
Trading securities   319
Fair Value Equity 320  
Recurring basis | Level 1 | Foreign equity securities | Other current assets    
Assets:    
Trading securities   4
Fair Value Equity 4  
Recurring basis | Level 1 | Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Short term investments    
Assets:    
Trading securities 111 438
Recurring basis | Level 1 | High yield securities | Short term investments    
Assets:    
Trading securities 21 21
Recurring basis | Level 1 | Money market funds held in trading accounts | Short term investments    
Assets:    
Trading securities 8 10
Recurring basis | Level 1 | Money market funds held in trading accounts | Other current assets    
Assets:    
Trading securities 5 5
Recurring basis | Level 1 | Other trading securities | Short term investments    
Assets:    
Trading securities 5 6
Recurring basis | Level 1 | Fixed income mutual funds | Other current assets    
Assets:    
Trading securities 3 2
Recurring basis | Level 2    
Assets:    
Total Assets 55 33
Liabilities:    
Liabilities 1 6
Recurring basis | Level 2 | Foreign currencies    
Assets:    
Derivatives   3
Liabilities:    
Derivatives 1 6
Recurring basis | Level 2 | Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries | Short term investments    
Assets:    
Trading securities 24 1
Recurring basis | Level 2 | Collateralized loan obligation | Short term investments    
Assets:    
Trading securities 28 $ 29
Recurring basis | Level 2 | Other trading securities | Short term investments    
Assets:    
Trading securities $ 3