Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Treasury Stock, Value	[1]	$ (4,677)		$ (3,591)
Common stock dividends, per share		$ 1.30	$ 0.92
Treasury Stock and Other
Treasury Stock, Value		$ (4,777)	$ (3,374)
Deferred Compensation Equity		(1)	(1)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 101	$ 101	$ 103
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 3,044	$ 3,044
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		3,044	3,044
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,469	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		3,788	$ 2,090
Series H Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 4,285

[1] Includes noncontrolling interest of $101 million and $103 million at September 30, 2018 and December 31, 2017, respectively.