Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Members Equity	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2013	$ 34,612	$ 34,367	$ 245
Increase (Decrease) in Total Equity [Roll Forward]
Comprehensive income, net of tax	3,622	3,869	(247)
Cash distributions to Parent	(3,500)	(3,500)	0
Balance at Dec. 31, 2014	34,734	34,736	(2)
Increase (Decrease) in Total Equity [Roll Forward]
Comprehensive income, net of tax	4,298	4,248	50
Cash distributions to Parent	(4,000)	(4,000)	0
Balance at Dec. 31, 2015	35,032	34,984	48
Increase (Decrease) in Total Equity [Roll Forward]
Comprehensive income, net of tax	3,640	3,569	71
Cash distributions to Parent	(2,500)	(2,500)	0
Balance at Dec. 31, 2016	$ 36,172	$ 36,053	$ 119