Consolidated Statements of Equity (USD $) In Millions, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Reinvested Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2010	$ 9,800	$ 237	$ 301	$ 9,227	$ 12,075	$ (5,790)	$ (6,727)	$ 477
Sale of a majority interest in a consolidated subsidiary	(3)							(3)
Net income	3,599				3,559			40
Other comphrehensive income (loss)	(2,978)					(2,960)		(18)
Common dividends	(1,542)				(1,531)			(11)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	1,014		7	1,007
Repurchased	(672)						(672)
Retired	0		(4)	(127)	(541)		672
Balance at Dec. 31, 2011	9,208	237	304	10,107	13,552	(8,750)	(6,727)	485
Acquisitions of a noncontrolling interest in consolidated subsidiaries	(388)			(2)				(386)
Net income	2,780				2,755			25
Other comphrehensive income (loss)	132					104		28
Common dividends	(1,654)				(1,593)			(61)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	631		4	627
Repurchased	(400)						(400)
Retired	0		(2)	(77)	(321)		400
Balance at Dec. 31, 2012	10,299	237	306	10,655	14,383	(8,646)	(6,727)	91
Sale of a majority interest in a consolidated subsidiary	(34)							(34)
Acquisitions of a noncontrolling interest in consolidated subsidiaries	4			4
Net income	4,862				4,848			14
Other comphrehensive income (loss)	3,203					3,205		(2)
Common dividends	(1,670)				(1,658)			(12)
Preferred dividends	(10)				(10)
Common Stock
Issued - compensation plans	632		4	628
Repurchased	(1,000)						(1,000)
Retired	0		(6)	(215)	(779)		1,000
Balance at Dec. 31, 2013	$ 16,286	$ 237	$ 304	$ 11,072	$ 16,784	$ (5,441)	$ (6,727)	$ 57