Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018
Treasury Stock, Value	[1]	$ (5,599)				$ (5,422)
Common stock dividends, per share		$ 0.50	$ 0.50	$ 0.40	$ 0.40
Treasury Stock and Other
Treasury Stock, Value		$ (5,702)	$ (5,710)	$ (4,281)	$ (3,953)
Deferred Compensation Equity					(1)
Stockholders' Equity Attributable to Noncontrolling Interest		$ 103	$ 101	$ 103	$ 101	$ 103
Series A Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,022.22	$ 1,000.00	$ 1,022.22	$ 1,000.00
Series B Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,022.22	1,000.00	1,022.22	1,000.00
Series E Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid					1,468.75
Series F Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,406.25	1,406.25	1,406.25	1,406.25
Series G Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		1,262.50	1,262.50	1,262.50	1,262.50
Series H Preferred Stock [Member]
Preferred Stock, Dividends, Per Share, Cash Paid		$ 1,281.25	$ 1,281.25	$ 1,722.57	$ 1,281.25

[1] Includes noncontrolling interest of $103 million and $103 million at June 30, 2019 and December 31, 2018, respectively.