Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Treasury Stock, Value	[1]	$ (1,759)
Common stock dividends, per share		$ 0.24	$ 0.20
Treasury Stock and Other
Treasury Stock, Value		$ (1,859)	$ (1,215)
Deferred Compensation Equity		(1)	(15)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 101	$ 106
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,011	$ 1,000
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,011	1,000
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,469	1,469
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,406	$ 1,406

[1] Includes noncontrolling interest of $101 million and $108 million at March 31, 2016 and December 31, 2015, respectively.