Shareholders' Equity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			$ 13,615	$ 15,790
Shares repurchased			(800)	(4,356)
Stock plans			505	397
Payments of dividends to shareholders			(381)	(337)
Other			(17)	(25)
Comprehensive income (loss)	1,201	710	2,596	1,349
Balance at end of period	15,518	12,818	15,518	12,818
Company shareholders' equity
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			13,581	15,765
Shares repurchased			(800)	(4,356)
Stock plans			505	397
Payments of dividends to shareholders			(381)	(337)
Other			(13)	(22)
Comprehensive income (loss)			2,599	1,341
Balance at end of period	15,491	12,788	15,491	12,788
Noncontrolling interest in consolidated subsidiaries
Shareholders' equity activity [Roll Forward]
Balance at beginning of period			34	25
Shares repurchased			0	0
Stock plans			0	0
Payments of dividends to shareholders			0	0
Other			(4)	(3)
Comprehensive income (loss)			(3)	8
Balance at end of period	$ 27	$ 30	$ 27	$ 30