Consolidated Statements of Member's Equity - USD ($) $ in Millions	Total	AOCI Attributable to Parent	Member Units
MEMBER'S EQUITY
TOTAL MEMBER'S EQUITY		$ 18
Balance at beginning of period at Dec. 31, 2017		18	$ 19,254
MEMBER'S EQUITY
Net income (loss)	$ 190
Other comprehensive loss	(164)
Purchase price accounting adjustments			(5)
Distributions			(1,130)
Balance at end of period at Sep. 30, 2018		(140)	18,312
Balance at beginning of period at Jun. 30, 2018		(139)	18,749
MEMBER'S EQUITY
Net income (loss)	88
Other comprehensive loss	(1)
Distributions			(525)
Balance at end of period at Sep. 30, 2018		(140)	18,312
MEMBER'S EQUITY
TOTAL MEMBER'S EQUITY	18,172	(140)
TOTAL MEMBER'S EQUITY	17,877	(171)
Balance at beginning of period at Dec. 31, 2018		(171)	18,048
MEMBER'S EQUITY
Net income (loss)	(3,361)
Other comprehensive loss	(115)
Distributions			(709)
Balance at end of period at Sep. 30, 2019		(286)	13,978
Balance at beginning of period at Jun. 30, 2019		(176)	14,008
MEMBER'S EQUITY
Net income (loss)	114
Other comprehensive loss	(110)
Distributions			(144)
Balance at end of period at Sep. 30, 2019		(286)	$ 13,978
MEMBER'S EQUITY
TOTAL MEMBER'S EQUITY	$ 13,692	$ (286)