Weighted Average Shares Outstanding (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
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares outstanding - basic	1,325.5	1,340.3	1,323.5	1,345.2
Weighted Average Number Diluted Shares Outstanding Adjustment	22.1	0	23.8	0
Weighted average shares outstanding - assuming dilution	1,347.6	1,340.3	1,347.3	1,345.2
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		23.6		17.2
Stock Issued During Period, Shares, New Issues	2	6	13	16
Treasury Stock, Shares, Acquired		7	10	32
Payments for Repurchase of Common Stock		$ 75	$ 125	$ 275
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	13.0	18.0	13.0	18.0