CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests
Beginning Balance (in shares) at Dec. 31, 2014		1,985
Beginning Balance at Dec. 31, 2014	$ 23,525	$ 20	$ 0	$ 22,242	$ (366)	$ 1,629
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Stock issued through stock option and stock purchase plans (in shares)		10
Stock issued through stock option and stock purchase plans	170	$ 0	170
Tax benefit from stock options exercised	43		43
Restricted stock grants, cancellations and withholdings, net (in shares)		6
Restricted stock grants, cancellations and withholdings, net	(71)	$ 0	(71)
Repurchase of common stock (in shares)		(76)
Reversal of reclass of previously repurchased common stock	(2,033)	$ (1)	(20)	(2,012)
Stock-based compensation	560		560
Cash dividends declared	(453)			(453)
Impact from equity transactions of non-controlling interests	(901)		(682)			(219)
Change in market value of investments	(1)				(5)	4
Change in market value of derivatives	(2)				(1)	(1)
Translation adjustment	(86)				(86)
Net income	811			739		72
Ending Balance (in shares) at Jun. 30, 2015		1,925
Ending Balance at Jun. 30, 2015	$ 21,562	$ 19	0	20,516	(458)	1,485
Beginning Balance (in shares) at Dec. 31, 2015	1,943	1,943
Beginning Balance at Dec. 31, 2015	$ 22,719	$ 19	0	21,700	(579)	1,579
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Stock issued through stock option and stock purchase plans (in shares)		8
Stock issued through stock option and stock purchase plans	145	$ 1	144
Tax benefit from stock options exercised	(24)		(24)
Restricted stock grants, cancellations and withholdings, net (in shares)		4
Restricted stock grants, cancellations and withholdings, net	(45)	$ 0	(45)
Repurchase of common stock (in shares)		0
Reversal of reclass of previously repurchased common stock	0	$ 0	(590)	590
Stock-based compensation (in shares)		2
Stock-based compensation	660		660
Cash dividends declared	(460)			(460)
Impact from equity transactions of non-controlling interests	209		(145)			354
Change in market value of investments	36				30	6
Change in market value of derivatives	9				9	0
Translation adjustment	(21)				(21)
Net income	$ 927			849		78
Ending Balance (in shares) at Jun. 30, 2016	1,957	1,957
Ending Balance at Jun. 30, 2016	$ 24,155	$ 20	$ 0	$ 22,679	$ (561)	$ 2,017