Consolidated Statements of Changes in Shareholders' Equity (USD $) In Millions, except Share data in Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	AOCI [Member]	Noncontrolling Interests [Member]
Beginning balance, Value at Dec. 31, 2012	$ 21,223	$ 2,116	$ 3,499	$ 5,973	$ 10,129	$ (559)	$ 65
Beginning balance, Shares at Dec. 31, 2012			699,728
Add (Deduct):
Net Income	832				800		32
Net change in AOCI	(225)					(225)
Stock transactions:
In connection with equity awards, Shares			3,462
In connection with equity awards, Values	29		17	12
Shares repurchased in connection with equity awards, Shares			(754)
Shares repurchased in connection with equity awards, Value	(23)		(4)	(19)
In connection with dividend reinvestment plan, Shares			229
In connection with dividend reinvestment plan, Value	7		1	6
In connection with 401(k) plan, Shares			330
In connection with 401(k) plan, Value	11		2	9
In connection with preferred stock offerings	487	487
Cash dividends declared on common stock	(322)				(322)
Cash dividends declared on preferred stock	(43)				(43)
Equity-based compensation expense	60			60
Other, net	(40)			1			(41)
Ending balance, Value at Jun. 30, 2013	21,996	2,603	3,515	6,042	10,564	(784)	56
Ending balance, Shares at Jun. 30, 2013			702,995
Beginning balance, Value at Dec. 31, 2013	22,809	2,603	3,533	6,172	11,044	(593)	50
Beginning balance, Shares at Dec. 31, 2013			706,620
Add (Deduct):
Net Income	1,056				1,000		56
Net change in AOCI	187					187
Stock transactions:
In connection with equity awards, Shares			14,097
In connection with equity awards, Values	280		71	209
Shares repurchased in connection with equity awards, Shares			(2,177)
Shares repurchased in connection with equity awards, Value	(81)		(11)	(70)
Excess tax benefits in connection with equity awards	49			49
In connection with dividend reinvestment plan, Shares			391
In connection with dividend reinvestment plan, Value	15		2	13
In connection with 401(k) plan, Shares			653
In connection with 401(k) plan, Value	25		3	22
Cash dividends declared on common stock	(336)				(336)
Cash dividends declared on preferred stock	(74)				(74)
Equity-based compensation expense	56			56
Other, net	(21)						(21)
Ending balance, Value at Jun. 30, 2014	$ 23,965	$ 2,603	$ 3,598	$ 6,451	$ 11,634	$ (406)	$ 85
Ending balance, Shares at Jun. 30, 2014			719,584