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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative assets and liabilities
Asset Derivatives Fair Value	$ 288		$ 288		$ 90
Liability Derivatives Fair Value	(631)		(631)		(425)
Net loss deferred in AOCI	157		157
Net loss expected to be reclassified to earnings in the next twelve months			7
Interest Rate Derivatives
Derivative assets and liabilities
Unrealized gain (loss) on hedges	15	$ (3)	60	$ (15)
Derivatives in Hedging Relationships
Derivative assets and liabilities
Asset Derivatives Fair Value	15		15		2
Liability Derivatives Fair Value					(38)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	12		12
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	3		3
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities
Derivative assets and liabilities
Asset Derivatives Fair Value					2
Liability Derivatives Fair Value					(27)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Liability Derivatives Fair Value					(11)
Derivatives Not Designated as a Hedge
Derivative assets and liabilities
Asset Derivatives Fair Value	273		273		88
Liability Derivatives Fair Value	(631)		(631)		(387)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	146		146		73
Liability Derivatives Fair Value	(358)		(358)		(227)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net
Derivative assets and liabilities
Asset Derivatives Fair Value	54		54		1
Liability Derivatives Fair Value	(2)		(2)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities
Derivative assets and liabilities
Asset Derivatives Fair Value	60		60		5
Liability Derivatives Fair Value	(211)		(211)		(131)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits
Derivative assets and liabilities
Asset Derivatives Fair Value	9		9		3
Liability Derivatives Fair Value	(39)		(39)		(5)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets
Derivative assets and liabilities
Asset Derivatives Fair Value	4		4		6
Liability Derivatives Fair Value	(1)		(1)		(2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities
Derivative assets and liabilities
Liability Derivatives Fair Value	(1)		(1)
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option
Derivative assets and liabilities
Asset Derivatives Fair Value
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	$ (19)		$ (19)		$ (22)

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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