Weighted Average Shares Outstanding (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares outstanding - basic	1,323.2	1,343.5	1,322.4	1,347.7
Weighted Average Number Diluted Shares Outstanding Adjustment	21.8	15.1	24.7	0
Weighted average shares outstanding - assuming dilution	1,345.0	1,358.6	1,347.1	1,347.7
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				14.0
Stock Issued During Period, Shares, New Issues	1	1	11	9
Treasury Stock, Shares, Acquired		13	10	26
Payments for Repurchase of Common Stock		$ 100	$ 125	$ 200
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	16.0	13.0	25.0