Weighted Average Shares Outstanding (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average shares outstanding - basic	1,341.3	1,323.2	1,337.5	1,322.4
Weighted Average Number Diluted Shares Outstanding Adjustment	20.5	21.8	22.2	24.7
Weighted average shares outstanding - assuming dilution	1,361.8	1,345.0	1,359.7	1,347.1
Stock Issued During Period, Shares, New Issues	2.0	1.0	15.0	11.0
Treasury Stock, Shares, Acquired				10.0
Payments for Repurchase of Common Stock			$ 0	$ 125
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3.0	13.0	3.0	13.0