Equity, Share Activity Rollforward (Details) - shares	1 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Share Activity
Treasury stock, shares, beginning balance	(173,777,130)		(159,202,872)
Stock purchases, shares		(2,000,000)
Treasury stock, shares, ending balance			(173,777,130)
Subsequent Event [Member]
Share Activity
Stock purchases, shares	(675,000)
Common Stock [Member]
Share Activity
Common stock, shares, beginning balance	673,000,000	673,000,000	673,000,000	673,000,000
Stock issuances, shares			0	0
Common stock, shares, ending balance			673,000,000	673,000,000
Treasury Stock [Member]
Share Activity
Treasury stock, shares, beginning balance	(174,000,000)	(144,000,000)	(159,000,000)	(138,000,000)
Stock issuances, shares			2,000,000	2,000,000
Treasury stock, shares, ending balance			(174,000,000)	(144,000,000)
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member]
Share Activity
Stock purchases, shares			(2,000,000)	(1,000,000)
Treasury Stock [Member] | Common Stock Repurchase Program [Member]
Share Activity
Stock purchases, shares			(15,000,000)	(7,000,000)