Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Treasury Stock, Value	[1]	$ (5,422)		$ (3,591)
Common stock dividends, per share		$ 1.80		$ 1.32	$ 1.00
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net					$ (4)
Treasury Stock and Other
Treasury Stock, Value		$ (5,525)		$ (3,694)	(2,448)
Deferred Compensation Equity		0		0	(1)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 103		$ 103	$ 103
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 4,056		$ 4,056	$ 4,067
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		4,056		4,056	4,067
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,469	[2]	5,875	5,875
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		5,625		5,625	5,625
Series G Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		5,050		3,128	0
Series H Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 5,566		$ 669	$ 0

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

[2] All 4,500 shares of outstanding Series E Preferred Stock were redeemed in the first quarter of 2018.