Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Dividends declared per common share	$ 0.48	$ 0.54
Interest income:
Interest income	$ 491	$ 705
Interest expense	426	541
Net interest income	65	164
Other gain (loss), net:
Gain on sale of investment securities, net	494	60
Unrealized gain on investment securities measured at fair value through net income, net	197	1,060
Loss on derivative instruments and other securities, net	(3,154)	(1,000)
Total other gain (loss), net:	(2,463)	120
Expenses:
Compensation and benefits	13	10
Other operating expense	10	9
Total operating expense	23	19
Net income (loss)	(2,421)	265
Dividend on preferred stock	21	10
Net income (loss) available (attributable) to common stockholders	(2,442)	255
Other comprehensive income (loss):
Unrealized gain on investment securities measured at fair value through other comprehensive income, net	(464)	(400)
Comprehensive income (loss)	(1,957)	665
Comprehensive income (loss) available (attributable) to common stockholders	$ (1,978)	$ 655
Weighted average number of common shares outstanding - basic	548.0	536.7
Weighted average number of common shares outstanding - diluted	548.0	537.2
Net income (loss) per common share - basic	$ (4.46)	$ 0.48
Net income (loss) per common share - diluted	$ (4.46)	$ 0.47