Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions		Total	Common Stock	Additional Paid-In Capital	Unearned Compensation	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance at Dec. 31, 2015			$ 1,466	$ 1,438	$ (12)	$ (18,102)	$ 18,861	$ (3,950)	$ 255
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 2,586					2,441		145
Other comprehensive income (loss), net of tax		(242)						(230)	(12)
Dividends							(1,380)		(128)
Stock-based compensation expense				123
Shares issued for stock options				128		242
Shares issued for restricted stock awards				(60)		60
Treasury stock acquired						(1,335)
Other				62	5	0
Ending balance at Dec. 31, 2016			1,466	1,691	(7)	(19,135)	19,922	(4,180)	260
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,174					2,024		150
Other comprehensive income (loss), net of tax		342						325	17
Dividends							(1,405)		(124)
Stock-based compensation expense				127
Shares issued for stock options				197		313
Shares issued for restricted stock awards				(34)		34
Treasury stock acquired						(1,399)
Other				3	2	6	(10)
Ending balance at Dec. 31, 2017		243	1,466	1,984	(5)	(20,181)	20,531	(3,855)	303
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,558					2,400		158
Other comprehensive income (loss), net of tax		(189)						(170)	(19)
Dividends							(1,448)		(143)
Stock-based compensation expense				109
Shares issued for stock options				137		190
Shares issued for restricted stock awards				(31)		31
Treasury stock acquired						(1,238)
Other	[1]			5	2	2	132	(163)
Ending balance at Dec. 31, 2018		$ 197	$ 1,466	$ 2,204	$ (3)	$ (21,196)	$ 21,615	$ (4,188)	$ 299

[1] (1) As a result of the early adoption of ASU 2018-02, the Company reclassified the stranded tax effects in Accumulated other comprehensive income (loss) resulting from the TCJA to Retained earnings. See Note 2, Summary of Significant Accounting Policies for additional information.