Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 3,200	$ 2,946	$ 5,973	$ 4,082
Dividends distributed or available for distribution to senior preferred stockholder	(3,117)	(2,869)	(5,896)	(3,788)
Net income attributable to common stockholders	$ 83	$ 77	$ 77	$ 294
Weighted-average common shares outstanding, Basic	5,762	5,762	5,762	5,762
Convertible preferred stock	131	131	131	131
Weighted-average common shares outstanding, Diluted	5,893	5,893	5,893	5,893
Earnings per share, Basic	$ 0.01	$ 0.01	$ 0.01	$ 0.05
Earnings per share, Diluted	$ 0.01	$ 0.01	$ 0.01	$ 0.05
Weighted average shares of common stock that would be issued upon the full exercise of the warrant issued to Treasury	4,600	4,600	4,600	4,600