v3.7.0.1
Assets and Liabilities with Recurring Fair Value Measurements Fair Value Hierarchy (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] $ 128 $ 153
Commodity futures contracts 932 1,542
Commodity forward contracts [2] 636 697
Interest Rate Derivative Assets, Fair Value 21 29
Total assets 1,717 2,421
Commodity futures contracts 975 1,570
Commodity forward contracts [2] 418 478
Interest Rate Derivative Liabilities At Fair Value 57 58
Liabilities, Fair Value Disclosure 1,450 2,106
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 128 153
Commodity futures contracts 932 1,542
Commodity forward contracts [2] 0 0
Interest Rate Derivative Assets, Fair Value 0 0
Total assets 1,060 1,695
Commodity futures contracts 975 1,570
Commodity forward contracts [2] 0 0
Interest Rate Derivative Liabilities At Fair Value 0 0
Liabilities, Fair Value Disclosure 975 1,570
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 0 0
Commodity futures contracts 0 0
Commodity forward contracts [2] 285 231
Interest Rate Derivative Assets, Fair Value 21 29
Total assets 306 260
Commodity futures contracts 0 0
Commodity forward contracts [2] 361 411
Interest Rate Derivative Liabilities At Fair Value 57 58
Liabilities, Fair Value Disclosure 418 469
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [1] 0 0
Commodity futures contracts 0 0
Commodity forward contracts [2] 351 466
Interest Rate Derivative Assets, Fair Value 0 0
Total assets 351 466
Commodity futures contracts 0 0
Commodity forward contracts [2] 57 67
Interest Rate Derivative Liabilities At Fair Value 0 0
Liabilities, Fair Value Disclosure $ 57 $ 67
[1] As of June 30, 2017 and December 31, 2016, we had cash equivalents of $29 million and $26 million included in cash and cash equivalents and $99 million and $127 million included in restricted cash, respectively.
[2] Includes OTC swaps and options and retail contracts.