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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value $ 480 $ 90
Liability derivatives fair value (262) (425)
Initial margin 95 48
Variation margin posted/(returned) (91) 164
Letters of credit (184) (166)
Net broker payable (80)  
Net broker receivable   212
Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 443 79
Liability derivatives fair value (182) (229)
Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 34 1
Liability derivatives fair value (7) 0
Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   7
Liability derivatives fair value (20) (158)
Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 3 3
Liability derivatives fair value (53) (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 2 2
Liability derivatives fair value (9) (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 2 0
Liability derivatives fair value 0 0
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   2
Liability derivatives fair value (1) (27)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value (8) (11)
Derivatives Not Designated as a Hedge    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 478 88
Liability derivatives fair value (253) (387)
Derivatives Not Designated as a Hedge | Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 441 79
Liability derivatives fair value (182) (229)
Derivatives Not Designated as a Hedge | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 34 1
Liability derivatives fair value (7) 0
Derivatives Not Designated as a Hedge | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   5
Liability derivatives fair value (19) (131)
Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 3 3
Liability derivatives fair value (45) (27)
Derivatives Not Designated as a Hedge | Commodity Derivatives    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 478 82
Liability derivatives fair value (208) (363)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 441 73
Liability derivatives fair value (182) (227)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 34 1
Liability derivatives fair value (7) 0
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   5
Liability derivatives fair value (10) (131)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 3 3
Liability derivatives fair value (9) (5)
Derivatives Not Designated as a Hedge | Interest Rate Derivatives | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 6
Liability derivatives fair value (9) (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 6
Liability derivatives fair value 0 (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   0
Liability derivatives fair value (9) 0
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value (36) (22)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other current assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term assets, net    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value   0
Liability derivatives fair value 0 0
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits    
Derivatives, Fair Value [Line Items]    
Asset derivatives fair value 0 0
Liability derivatives fair value (36) (22)
Exchange Traded    
Derivatives, Fair Value [Line Items]    
Letters of credit $ (84) $ 0