Consolidated Statements of Change in Equity, AOCI - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest in Consolidated Subsidiaries [Member]	Redeemable Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2014	$ 12,392	$ 1	$ (743)	$ 9,938	$ 3,210	$ (46)	$ 32	$ 165
Beginning Balance, Shares at Dec. 31, 2014		116	(3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive loss	(142)					(142)
Exercise of common stock options	19			19
Treasury Stock, Shares, Acquired			(3)
Treasury Stock, Retired, Cost Method, Amount	(660)		$ (660)
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises, Shares			(1)
Restricted Stock And Option Withholding Taxes Recorded As Net Settlement	(45)		$ (45)
Stock-based compensation	122			122
Issuance of restricted stock		1
Tax benefits from stock option plans	19			19
Adjustment to redemption value of redeemable non-controlling interest	(5)				(5)			4
Distributions of profits to non-controlling interest	(16)						(16)	11
Purchase of subsidiary shares from non-controlling interest								128
Dividends paid to shareholders	(331)
Net income attributable to non-controlling interest	(5)				(21)		16	5
Net income	1,295				1,295
Ending Balance at Dec. 31, 2015	$ 14,840	$ 1	$ (1,448)	12,295	4,148	(188)	32	35
Ending Balance, Shares at Dec. 31, 2015	126	126	(7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Acquisitions		9
Stock Issued During Period, Value, Acquisitions	$ 2,197		$ 0	2,197
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income, Equity Method Investments, Net of Tax	2
Foreign currency translation adjustments	(45)
Fair value of available-for-sale securities	(26)
Employee benefit plans adjustments	(119)
Accumulated other comprehensive income	(188)
Other comprehensive loss	(128)					(128)
Exercise of common stock options	20			20
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises, Shares			0
Restricted Stock And Option Withholding Taxes Recorded As Net Settlement	(51)		$ (51)
Stock-based compensation	100			100
Payments relating to treasury shares received for restricted stock tax payments and stock option exercises	0
Distributions of profits to non-controlling interest	(18)						(18)	3
Dividends paid to shareholders	307				(307)
Net income attributable to non-controlling interest	(2)				(20)		18	2
Net income	1,090				1,090
Ending Balance at Sep. 30, 2016	$ 15,544	$ 1	$ (1,499)	$ 12,415	$ 4,911	$ (316)	$ 32	$ 34
Ending Balance, Shares at Sep. 30, 2016	126	126	(7)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income, Equity Method Investments, Net of Tax	$ 2
Foreign currency translation adjustments	(290)
Fair value of available-for-sale securities	91
Employee benefit plans adjustments	(119)
Accumulated other comprehensive income	$ (316)