Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Treasury Stock, Value	[1]	$ (3,274)
Common stock dividends, per share		$ 0.92	$ 0.74
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net			$ (4)
Treasury Stock and Other
Treasury Stock, Value		$ (3,374)	(2,232)
Deferred Compensation Equity		0	0
Stockholders' Equity Attributable to Noncontrolling Interest		$ 101	$ 101
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 3,044	$ 3,056
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		3,044	3,056
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		4,406	4,406
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		4,219	$ 4,219
Series G Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 2,090

[1] Includes noncontrolling interest of $101 million and $103 million at September 30, 2017 and December 31, 2016, respectively.