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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative assets and liabilities
Asset derivatives fair value	$ 239	$ 480
Liability derivatives fair value	(186)	(262)
Initial margin	73	95
Variation margin posted/(returned)	(45)	(91)
Letters of credit	(157)	(184)
Net broker payable	(45)	(80)
Other current assets
Derivative assets and liabilities
Asset derivatives fair value	183	443
Liability derivatives fair value	(39)	(182)
Other long-term assets, net
Derivative assets and liabilities
Asset derivatives fair value	24	34
Liability derivatives fair value		(7)
Other current liabilities
Derivative assets and liabilities
Asset derivatives fair value	32
Liability derivatives fair value	(101)	(20)
Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset derivatives fair value		3
Liability derivatives fair value	(46)	(53)
Derivatives not designated as a Hedge
Derivative assets and liabilities
Asset derivatives fair value	239	478
Liability derivatives fair value	(142)	(253)
Derivatives not designated as a Hedge | Other current assets
Derivative assets and liabilities
Asset derivatives fair value	183	441
Liability derivatives fair value	(39)	(182)
Derivatives not designated as a Hedge | Other long-term assets, net
Derivative assets and liabilities
Asset derivatives fair value	24	34
Liability derivatives fair value		(7)
Derivatives not designated as a Hedge | Other current liabilities
Derivative assets and liabilities
Asset derivatives fair value	32
Liability derivatives fair value	(57)	(19)
Derivatives not designated as a Hedge | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset derivatives fair value		3
Liability derivatives fair value	(46)	(45)
Derivatives not designated as a Hedge | Commodity Derivatives
Derivative assets and liabilities
Asset derivatives fair value	235	478
Liability derivatives fair value	(105)	(208)
Derivatives not designated as a Hedge | Commodity Derivatives | Other current assets
Derivative assets and liabilities
Asset derivatives fair value	179	441
Liability derivatives fair value	(37)	(182)
Derivatives not designated as a Hedge | Commodity Derivatives | Other long-term assets, net
Derivative assets and liabilities
Asset derivatives fair value	24	34
Liability derivatives fair value		(7)
Derivatives not designated as a Hedge | Commodity Derivatives | Other current liabilities
Derivative assets and liabilities
Asset derivatives fair value	32
Liability derivatives fair value	(56)	(10)
Derivatives not designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset derivatives fair value		3
Liability derivatives fair value	(12)	(9)
Derivatives not designated as a Hedge | Foreign Currency Derivatives
Derivative assets and liabilities
Asset derivatives fair value	4
Liability derivatives fair value	(3)	(9)
Derivatives not designated as a Hedge | Foreign Currency Derivatives | Other current assets
Derivative assets and liabilities
Asset derivatives fair value	4
Liability derivatives fair value	(2)
Derivatives not designated as a Hedge | Foreign Currency Derivatives | Other current liabilities
Derivative assets and liabilities
Liability derivatives fair value	(1)	(9)
Derivatives not designated as a Hedge | Preferred Distribution Rate Reset Option
Derivative assets and liabilities
Liability derivatives fair value	(34)	(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	(34)	(36)
Derivatives in Hedging Relationships | Interest Rate Derivatives
Derivative assets and liabilities
Asset derivatives fair value		2
Liability derivatives fair value	(44)	(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	(44)	(1)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability derivatives fair value		(8)
Exchange Traded
Derivative assets and liabilities
Letters of credit	$ (73)	$ (84)

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