Equity - Share Repurchases Transacted Through ASR Programs and Open Market Transactions (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended			30 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013	Jun. 30, 2014
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	5	11	[1]	13	[1]	17	78
Cash paid for shares repurchased	$ 459	$ 882		$ 1,148		$ 1,313	$ 5,290
Effective average cost per delivered share	$ 88.14	$ 80.31		$ 87.82		$ 80.54	$ 67.65
Accelerated Share Repurchase Program November 2012
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased						1

[1] The six months ended June 30, 2013 includes one million shares received under the November 2012 accelerated share repurchase program, which were paid for in 2012.