Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Member’s Equity	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2016	$ 36,172	$ 36,053	$ 119
Increase (Decrease) in Total Equity [Roll Forward]
Cash distributions	(4,575)	(4,575)	0
Comprehensive income (loss), net of tax	11,412	11,300	112
Balance at Dec. 31, 2017	43,009	42,778	231
Increase (Decrease) in Total Equity [Roll Forward]
Cash distributions	(5,450)	(5,450)	0
Comprehensive income (loss), net of tax	5,093	5,219	(126)
Balance at Dec. 31, 2018	42,649	42,519	130
Increase (Decrease) in Total Equity [Roll Forward]
Cash distributions	(4,425)	(4,425)	0
Comprehensive income (loss), net of tax	5,496	5,481	15
Balance at Dec. 31, 2019	$ 43,720	$ 43,575	$ 145