Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Members Equity	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2012	$ 34,329	$ 34,574	$ (245)
Increase (Decrease) in Total Equity [Roll Forward]
Comprehensive income, net of tax	4,283	3,793	490
Cash distributions to Parent	(4,000)	(4,000)	0
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