Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Treasury Stock, Value	[1]	$ (2,712)
Common stock dividends, per share		$ 0.26	$ 0.24
Treasury Stock and Other
Treasury Stock, Value		$ (2,812)	$ (1,859)
Deferred Compensation Equity		(1)	(1)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 101	$ 101
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,000	$ 1,011
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,000	1,011
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,469	1,469
Series F Preferred Stock [Member] | Additional Paid-in Capital [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,406	$ 1,406

[1] Includes noncontrolling interest of $101 million and $103 million at March 31, 2017 and December 31, 2016, respectively.