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Derivative Instruments and Hedging Activities - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,232	$ 2,054	$ 2,263	$ 2,224
Mark-to-market of cash flow hedge accounting contracts	8	(1)	0	2
Balance at end of period	2,237	2,046	2,237	2,046
Accumulated OCL ending balance, income tax expense (benefit)	6	6	6	6
Accumulated other comprehensive loss	(15)		(15)		$ (15)
Losses expected to be realized from OCL during the next 12 months, net of income tax benefit of $4	(9)		(9)
Losses expected to be realized from OCL during the next 12 months, tax expense (benefit)	4		4
AOCI Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(39)	(35)	(31)	(38)
Balance at end of period	(31)	(36)	(31)	(36)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	2	(2)	5	15
Mark-to-market of cash flow hedge accounting contracts	6	1	(5)	(13)
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(19)	(16)	(15)	(18)
Balance at end of period	(15)	(17)	(15)	(17)
Accumulated other comprehensive loss	(15)	(17)	(15)	(17)
AOCI Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Accumulated other comprehensive loss	(16)	(19)	(16)	(19)
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	370	322	413	402
Balance at end of period	$ 355	$ 298	$ 355	$ 298

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- Definition

The estimated tax impact of existing gains or losses on cash flow hedges, at the reporting date, which are expected to be reclassified to earnings within the next 12 months.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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