Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions		Total		Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]		Retained Earnings [Member]		Treasury Stock and Other	[1]	AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total shareholders' equity		$ 23,005		$ 1,225	$ 550	$ 9,089		$ 13,295		$ (1,032)		$ (122)
Common Stock, Shares, Outstanding					525,000
Net Income (Loss) Attributable to Parent		912						912
Other Comprehensive Income (Loss), Net of Tax		(172)										(172)
Dividends, Common Stock, Cash		(229)						(229)
Dividends, Preferred Stock, Cash	[2]	(32)						(32)
Treasury Stock, Shares, Acquired					(7,000)
Treasury Stock, Value, Acquired, Cost Method		(290)								(290)
Payments for Repurchase of Warrants		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0
Stock Issued During Period, Value, Stock Options Exercised		(8)				(14)				(22)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		10				5		(2)		7
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		9								9
Stock Issued During Period, Shares, Employee Benefit Plan					0
Stock Issued During Period, Value, Employee Benefit Plan		2				0				2
Total shareholders' equity		23,223		1,225	$ 550	9,080		13,944		(1,282)		(294)
Common Stock, Shares, Outstanding					518,000
Total shareholders' equity		$ 23,437		1,225	$ 550	9,094		14,686		(1,658)		(460)
Common Stock, Shares, Outstanding		508,712	[3]		509,000
Cumulative effect of credit risk adjustment		$ 0						5	[4]			(5)	[4],[5]
Net Income (Loss) Attributable to Parent		939						939
Other Comprehensive Income (Loss), Net of Tax		698										698
Noncontrolling Interest, Period Increase (Decrease)		(5)	[2]							(5)
Dividends, Common Stock, Cash		(241)						(241)
Dividends, Preferred Stock, Cash		(33)						(33)	[2]
Treasury Stock, Shares, Acquired					(9,000)
Treasury Stock, Value, Acquired, Cost Method		(326)								(326)
Payments for Repurchase of Warrants		(24)				(24)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0
Stock Issued During Period, Value, Stock Options Exercised		(11)				(22)	[6]			(33)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures					1,000
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures		6				(45)	[6]	(3)		54
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition		2								2
Total shareholders' equity		$ 24,464		$ 1,225	$ 550	$ 9,003		$ 15,353		$ (1,900)		$ 233
Common Stock, Shares, Outstanding		501,412	[3]		501,000

[1] At June 30, 2016, includes ($2,003) million for treasury stock, $0 million for the compensation element of restricted stock, and $103 million for noncontrolling interest.At June 30, 2015, includes ($1,379) million for treasury stock, ($11) million for the compensation element of restricted stock, and $108 million for noncontrolling interest.

[2] For the six months ended June 30, 2016, dividends were $2,033 per share for both Perpetual Preferred Stock Series A and B, $2,938 per share for Perpetual Preferred Stock Series E, and $2,813 per share for Perpetual Preferred Stock Series F.For the six months ended June 30, 2015, dividends were $2,022 per share for both Perpetual Preferred Stock Series A and B, $2,938 per share for Perpetual Preferred Stock Series E, and $3,406 per share for Perpetual Preferred Stock Series F.

[3] Includes restricted shares of 49 thousand and 1,334 thousand at June 30, 2016 and December 31, 2015, respectively.

[4] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk, beginning January 1, 2016. See Note 1, "Significant Accounting Policies," and Note 17, "Accumulated Other Comprehensive Income/(Loss)," for additional information.

[5] Related to the Company's early adoption of the ASU 2016-01 provision related to changes in instrument-specific credit risk. See Note 1, "Significant Accounting Policies," for additional information.

[6] Includes a ($4) million net reclassification of excess tax benefits from additional paid-in capital to provision for income taxes, related to the Company's early adoption of ASU 2016-09. See Note 1, "Significant Accounting Policies," and Note 11, "Employee Benefit Plans," for additional information.