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, 2017			$ 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 (in dollars per share)	[1]						(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				5	2	2	132	(163)	[2]
Ending balance at Dec. 31, 2018			1,466	2,204	(3)	(21,196)	21,615	(4,188)		299
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,527					2,367			160
Other comprehensive income (loss), net of tax		(87)						(85)		(2)
Dividends (in dollars per share)	[1]						(1,472)			(141)
Stock-based compensation expense				100
Shares issued for stock options				210		305
Shares issued for restricted stock awards				(29)		29
Noncontrolling interests acquired										125
Treasury stock acquired						(1,202)
Other	[2]			3	1	1	(9)
Ending balance at Dec. 31, 2019		558	1,466	2,488	(2)	(22,063)	22,501	(4,273)		441
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		2,860					2,695			165
Other comprehensive income (loss), net of tax		(66)						(72)		6
Dividends (in dollars per share)	[1]						(1,502)			(152)
Stock-based compensation expense				107
Shares issued for stock options				400		462
Shares issued for restricted stock awards				(31)		31
Noncontrolling interests acquired										(99)
Treasury stock acquired						(1,476)
Other				5	1	1	5			(3)
Ending balance at Dec. 31, 2020		$ 1,101	$ 1,466	$ 2,969	$ (1)	$ (23,045)	$ 23,699	$ (4,345)		$ 358

[1] * Two dividends were declared in each of the first quarters of 2020, 2019 and 2018.

[2] (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 Tax Cuts and Jobs Act to Retained earnings.