Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Treasury Stock, Value	[1]	$ (1,658)	$ (1,032)	$ (1,658)	$ (1,032)
Common stock dividends, per share		$ 0.20	$ 0.24	$ 0.92	$ 0.70	$ 0.35
Treasury Stock and Other
Treasury Stock, Value		$ (1,764)	$ (1,119)	$ (1,764)	$ (1,119)	$ (684)
Deferred Compensation Equity		(2)	(21)	(2)	(21)	(50)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 108	$ 108	$ 108	$ 108	$ 119
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid				$ 4,056	$ 4,056	$ 4,056
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid				4,056	4,056	4,056
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid				5,875	5,875	$ 5,793
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid				$ 6,219	$ 0

[1] Includes noncontrolling interest of $108 million and $108 million at December 31, 2015 and December 31, 2014, respectively.