Consolidated Statements of Stockholders' Equity (USD $) In Millions	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock, at cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2010		$ 14	$ 3,034	$ 7,409	$ (4,247)	$ 16	$ 6,226
Beginning Balance (in shares) at Dec. 31, 2010		1,429
Net income				864			864
Other comprehensive income (loss), net of tax						(8)	(8)
Issuance of common stock for business acquisition (in shares)		59
Issuance of common stock for business acquisition		1	713				714
Dividends declared on common stock				(295)			(295)
Stock option exercises and other			(24)		122		98
Stock-based compensation and related tax effects			99				99
Other			4		12		16
Ending Balance at Dec. 31, 2011		15	3,826	7,978	(4,113)	8	7,714
Ending Balance (in shares) at Dec. 31, 2011		1,488
Net income				928			928
Other comprehensive income (loss), net of tax						290	290
Issuance of preferred stock	863						863
Dividends declared on preferred stock				(43)			(43)
Dividends declared on common stock				(308)			(308)
Stock option exercises and other			(40)		76		36
Stock-based compensation and related tax effects			98				98
Other	2		(3)	(1)	13		11
Ending Balance at Dec. 31, 2012	865	15	3,881	8,554	(4,024)	298	9,589
Ending Balance (in shares) at Dec. 31, 2012		1,488
Net income				1,071			1,071
Other comprehensive income (loss), net of tax						(289)	(289)
Dividends declared on preferred stock				(57)			(57)
Dividends declared on common stock				(311)			(311)
Stock option exercises and other			(54)		314		260
Stock-based compensation and related tax effects			119				119
Other	4		5	(4)	(6)		(1)
Ending Balance at Dec. 31, 2013	$ 869	$ 15	$ 3,951	$ 9,253	$ (3,716)	$ 9	$ 10,381
Ending Balance (in shares) at Dec. 31, 2013		1,488