Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock Issued	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Noncontrolling Interests	Noncontrolling Interests Dividend Declared	Accumulated Other Comprehensive Income (Loss)
Treasury Stock, Value at Dec. 31, 2013				$ (3,746)
Common Stock, Value, Issued at Dec. 31, 2013		$ 536
Additional Paid in Capital at Dec. 31, 2013			$ 594
Retained Earnings (Accumulated Deficit) at Dec. 31, 2013					$ 9,714
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance at Dec. 31, 2013								$ (2,242)
Beginning Balance at Dec. 31, 2013						$ 284
Beginning Balance, treasury stock (in shares) at Dec. 31, 2013				47,798,000
Increase (Decrease) in Stockholders' Equity
Net income in stockholders' equity	$ 1,595				1,526
Net income in stockholders' equity, noncontrolling interests						39
Other comprehensive income, net of tax, attributable to parent	448							(1,078)
Other comprehensive income, net of tax, attributable to noncontrolling interest	(57)					(11)
Stock-based awards exercised or vested			(54)	$ 180
Stock-based awards exercised or vested (in shares)				(2,783,000)
Income tax benefits on stock-based compensation	19		32
Shares repurchased (in shares)				18,246,000
Shares repurchased				$ (2,031)
Recognition of stock-based compensation			52
Dividends declared					(1,256)
Spin-off of health care business					(1,505)			9
Dividends declared to noncontrolling interests							$ (43)
Other			8		(9)	1		(1)
Ending Balance (in shares) at Dec. 31, 2014		428,597,000
Ending Balance at Dec. 31, 2014						270
Ending Balance, treasury stock (in shares) at Dec. 31, 2014				63,261,000
Beginning Balance (in shares) at Dec. 31, 2013		428,597,000
Treasury Stock, Value at Dec. 31, 2014				$ (5,597)
Common Stock, Value, Issued at Dec. 31, 2014		$ 536
Additional Paid in Capital at Dec. 31, 2014			632
Retained Earnings (Accumulated Deficit) at Dec. 31, 2014					8,470
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance at Dec. 31, 2014								(3,312)
Increase (Decrease) in Stockholders' Equity
Net income in stockholders' equity	1,066				1,013
Net income in stockholders' equity, noncontrolling interests						48
Other comprehensive income, net of tax, attributable to parent	1,058							45
Other comprehensive income, net of tax, attributable to noncontrolling interest	(33)					(20)
Stock-based awards exercised or vested			(47)	$ 186
Stock-based awards exercised or vested (in shares)				(2,888,000)
Income tax benefits on stock-based compensation	29		32
Shares repurchased (in shares)				7,364,000
Shares repurchased				$ (833)
Recognition of stock-based compensation			75
Dividends declared					(1,280)
Dividends declared to noncontrolling interests							(36)
Shares purchased from noncontrolling interests, adjustments to additional paid in capital	(94)		(94)
Shares purchased from noncontrolling interests, decrease from purchase of noncontrolling interests								(12)
Shares purchased from noncontrolling interest						(45)
Other			11			(3)		1
Shares retired (shares)		(50,000,000)		(50,000,000)
Shares retired (amount)		$ (63)		$ 3,272	(3,209)
Ending Balance (in shares) at Dec. 31, 2015		378,597,000
Ending Balance at Dec. 31, 2015	$ 40					214
Ending Balance, treasury stock (in shares) at Dec. 31, 2015	17,737,000			17,737,000
Beginning Balance (in shares) at Dec. 31, 2014		428,597,000
Treasury Stock, Value at Dec. 31, 2015	$ 2,972			$ (2,972)
Common Stock, Value, Issued at Dec. 31, 2015	473	$ 473
Additional Paid in Capital at Dec. 31, 2015	609		609
Retained Earnings (Accumulated Deficit) at Dec. 31, 2015	4,994				4,994
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance at Dec. 31, 2015	(3,278)							(3,278)
Increase (Decrease) in Stockholders' Equity
Net income in stockholders' equity	2,219				2,166
Net income in stockholders' equity, noncontrolling interests						49
Other comprehensive income, net of tax, attributable to parent	1,970							(196)
Other comprehensive income, net of tax, attributable to noncontrolling interest	(44)					(8)
Stock-based awards exercised or vested			(14)	$ 121
Stock-based awards exercised or vested (in shares)				(1,906,000)
Income tax benefits on stock-based compensation	28		19
Shares repurchased (in shares)				6,198,000
Shares repurchased				$ (778)
Recognition of stock-based compensation			77
Dividends declared					(1,322)
Dividends declared to noncontrolling interests							$ (36)
Other			6		(7)
Ending Balance (in shares) at Dec. 31, 2016		378,597,000
Ending Balance at Dec. 31, 2016	$ 117					$ 219
Ending Balance, treasury stock (in shares) at Dec. 31, 2016	22,029,000			22,029,000
Beginning Balance (in shares) at Dec. 31, 2015		378,597,000
Treasury Stock, Value at Dec. 31, 2016	$ 3,629			$ (3,629)
Common Stock, Value, Issued at Dec. 31, 2016	473	$ 473
Additional Paid in Capital at Dec. 31, 2016	697		$ 697
Retained Earnings (Accumulated Deficit) at Dec. 31, 2016	5,831				$ 5,831
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance at Dec. 31, 2016	$ (3,474)							$ (3,474)