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Incentive Stock Programs - Options (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) $ / shares shares
Incentive Stock Program
Total unrecognized compensation cost	$ 645
Total unrecognized compensation cost, recognition period	3 years
Stock options
Incentive Stock Program
Stock options outstanding, number of shares | shares	30,091,814
Exercisable options, number of shares | shares	23,273,096
Stock options outstanding, weighted-average remaining life	6 years
Exercisable options, weighted-average remaining life	5 years 2 months 12 days
Stock options outstanding, weighted-average exercise price (in dollars per share) | $ / shares	$ 62.45
Exercisable options, weighted-average exercise price (in dollars per share) | $ / shares	$ 51.56
Aggregate intrinsic value of options outstanding	$ 1,631
Aggregate intrinsic value of options exercisable	$ 1,498

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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