Stockholders' Equity (Components of Stockholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning balance	$ 5,529
Net Income	1,828	1,684	1,943
Unrealized Translation	(215)	249	(334)
Employee postretirement benefits	(377)	(134)	55
Other	(16)	(30)	(16)
Comprehensive Income	1,650	1,271	2,316
Redemption of redeemable preferred securities	0	(500)	0
Ending Balance	5,287	5,529
Comprehensive Income [Member]
Net Income	1,828	1,684	1,943
Unrealized Translation	215	(249)	334
Employee postretirement benefits	(377)	(134)	55
Other	(16)	(30)	(16)
The Corporation [Member]
Beginning balance	5,249	5,917	5,406
Net Income	1,750	1,591	1,843
Unrealized Translation	195	(236)	326
Employee postretirement benefits	(372)	(133)	57
Other	(16)	(31)	(16)
Stock-based awards exercised or vested	565	443	133
Income tax benefits on stock-based compensation	43	10	2
Shares repurchased	(1,333)	(1,247)	(809)
Recognition of stock-based compensation	67	48	52
Dividends declared	(1,163)	(1,107)	(1,085)
Stockholders' Equity, Other	0	6	(8)
Redemption of redeemable preferred securities		0
Return on redeemable preferred securities and noncontrolling interests	0	0	0
Ending Balance	4,985	5,249	5,917
Noncontrolling Interests [Member]
Beginning balance	280	285	284
Net Income	47	39	44
Unrealized Translation	20	(13)	7
Employee postretirement benefits	(5)	(1)	(2)
Other	0	1	0
Stock-based awards exercised or vested	0	0	0
Income tax benefits on stock-based compensation	0	0	0
Shares repurchased	0	0	0
Recognition of stock-based compensation	0	0	0
Dividends declared	(38)	(29)	(47)
Stockholders' Equity, Other	0	0	(1)
Redemption of redeemable preferred securities		0
Return on redeemable preferred securities and noncontrolling interests	(2)	(2)	0
Ending Balance	302	280	285
Redeemable Securities of Subsidiaries [Member]
Beginning balance	547	1,047	1,052
Net Income	31	54	56
Unrealized Translation	0	0	1
Employee postretirement benefits	0	0	0
Other	0	0	0
Stock-based awards exercised or vested	0	0	0
Income tax benefits on stock-based compensation	0	0	0
Shares repurchased	0	0	0
Recognition of stock-based compensation	0	0	0
Dividends declared	(1)	(1)	(1)
Stockholders' Equity, Other	0	(4)	7
Redemption of redeemable preferred securities		500
Return on redeemable preferred securities and noncontrolling interests	(28)	(57)	(54)
Ending Balance	$ 549	$ 547	$ 1,047