Incentive Stock Programs (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award
Incentive stock programs, shares reserved for future grants	87,000,000
Total unrecognized compensation cost \| $	$ 209
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, stock options (in shares)	5,577,553
Stock options outstanding, number of shares	36,258,229
Exercisable options, number of shares	26,691,599
Stock options outstanding, weighted-average remaining life	4 years 8 months 12 days
Exercisable options, weighted-average remaining life	3 years 2 months 12 days
Stock options outstanding, weighted-average exercise price (in dollars per share) \| $ / shares	$ 31.23
Exercisable options, weighted-average exercise price (in dollars per share) \| $ / shares	$ 26.94
Aggregate intrinsic value of options outstanding \| $	$ 367
Aggregate intrinsic value of options exercisable \| $	$ 357
Total unrecognized compensation cost, recognition period	3 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, restricted stock (in shares)	662,553
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, restricted stock (in shares)	5,864,895

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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