Consolidated Statements of Changes in Equity (Deficit) - USD ($) $ in Millions	Total	Senior Preferred Stock	Preferred Stock	Common Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock	Noncontrolling Interest
Senior preferred stock dividends paid per share	$ (9,624)				$ (9,624)
Proceeds from senior preferred stock purchase agreement with Treasury	0
Balance (shares) at Dec. 31, 2015		1,000,000	556,000,000	1,158,000,000
Balance at Dec. 31, 2015	4,059	$ 117,149	$ 19,130	$ 687	(126,942)	$ 1,407	$ (7,401)	$ 29
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Change in investment in noncontrolling interest	(29)							(29)
Comprehensive income:
Net income	12,313				12,313
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	12,313							0
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on available-for-sale securities (net of tax of $30, $28 and $21, respectively)	(55)					(55)
Reclassification adjustment for gains included in net income (net of tax of $316, $139 and $70, respectively)	(587)					(587)
Prior service cost and actuarial gains, net of amortization for defined benefit plans (net of tax)	(6)					(6)
Other, net of tax	(6)
Total comprehensive income	11,665
Balance at Dec. 31, 2016	6,071	$ 117,149	$ 19,130	$ 687	(124,253)	759	(7,401)	0
Balance (shares) at Dec. 31, 2016		1,000,000	556,000,000	1,158,000,000
Senior preferred stock dividends paid per share	(12,015)				(12,015)
Proceeds from senior preferred stock purchase agreement with Treasury	0
Comprehensive income:
Net income	2,463				2,463
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,463							0
Other comprehensive income, net of tax effect:
Changes in net unrealized gains on available-for-sale securities (net of tax of $30, $28 and $21, respectively)	53					53
Reclassification adjustment for gains included in net income (net of tax of $316, $139 and $70, respectively)	(259)					(259)
Other, net of tax	0
Total comprehensive income	2,257
Balance at Dec. 31, 2017	3,686	$ 117,149	$ 19,130	$ 687	(133,805)	553	(7,400)	0
Balance (shares) at Dec. 31, 2017		1,000,000	556,000,000	1,158,000,000
Other comprehensive income, net of tax effect:
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect						0
Stockholders' Equity, Other	1
Senior preferred stock value	$ 117,149
Senior preferred stock issued, shares	1,000,000
Senior preferred stock dividends paid per share	$ (9,372)				(9,372)
Proceeds from senior preferred stock purchase agreement with Treasury	3,687	$ 3,687
Net income	15,959				15,959
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15,959							0
Changes in net unrealized gains on available-for-sale securities (net of tax of $30, $28 and $21, respectively)	(79)					(79)
Reclassification adjustment for gains included in net income (net of tax of $316, $139 and $70, respectively)	(265)					(265)
Prior service cost and actuarial gains, net of amortization for defined benefit plans (net of tax)	(4)					(4)
Other, net of tax	(4)
Total comprehensive income	15,611
Balance at Dec. 31, 2018	6,240	$ 120,836	$ 19,130	$ 687	(127,335)	322	$ (7,400)	$ 0
Balance (shares) at Dec. 31, 2018		1,000,000	556,000,000	1,158,000,000
Other comprehensive income, net of tax effect:
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect					$ (117)	$ 117
Senior preferred stock value	$ 120,836
Senior preferred stock issued, shares	1,000,000