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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative assets and liabilities
Asset Derivatives Fair Value	$ 436		$ 436		$ 480
Liability Derivatives Fair Value	(187)		(187)		(262)
Net loss expected to be reclassified to earnings in the next twelve months			8
Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	393		393		443
Liability Derivatives Fair Value	(97)		(97)		(182)
Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	37		37		34
Liability Derivatives Fair Value	(4)		(4)		(7)
Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(51)		(51)		(20)
Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	6		6		3
Liability Derivatives Fair Value	(35)		(35)		(53)
Interest Rate Derivatives
Derivative assets and liabilities
Net unrealized gain/(loss) recognized in AOCI	(35)	$ 13	(58)	$ 45
Derivatives in Hedging Relationships | Interest Rate Derivatives
Derivative assets and liabilities
Asset Derivatives Fair Value					2
Liability Derivatives Fair Value	(43)		(43)		(9)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value					2
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(43)		(43)		(1)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability Derivatives Fair Value					(8)
Derivatives Not Designated as a Hedge
Derivative assets and liabilities
Asset Derivatives Fair Value	436		436		478
Liability Derivatives Fair Value	(144)		(144)		(253)
Derivatives Not Designated as a Hedge | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	393		393		441
Liability Derivatives Fair Value	(97)		(97)		(182)
Derivatives Not Designated as a Hedge | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	37		37		34
Liability Derivatives Fair Value	(4)		(4)		(7)
Derivatives Not Designated as a Hedge | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(8)		(8)		(19)
Derivatives Not Designated as a Hedge | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	6		6		3
Liability Derivatives Fair Value	(35)		(35)		(45)
Derivatives Not Designated as a Hedge | Commodity Derivatives
Derivative assets and liabilities
Asset Derivatives Fair Value	432		432		478
Liability Derivatives Fair Value	(123)		(123)		(208)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	389		389		441
Liability Derivatives Fair Value	(96)		(96)		(182)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	37		37		34
Liability Derivatives Fair Value	(4)		(4)		(7)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(8)		(8)		(10)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	6		6		3
Liability Derivatives Fair Value	(15)		(15)		(9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives
Derivative assets and liabilities
Asset Derivatives Fair Value	4		4
Liability Derivatives Fair Value	(1)		(1)		(9)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	4		4
Liability Derivatives Fair Value	(1)		(1)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value					(9)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option
Derivative assets and liabilities
Liability Derivatives Fair Value	(20)		(20)		(36)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability Derivatives Fair Value	(20)		(20)		$ (36)
AOCI cash flow hedge
Derivative assets and liabilities
Net loss deferred in AOCI	$ 230		$ 230

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