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Stock-based compensation (Summary of Stock Options) (Details) - Stock options [Member] $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Options
Balance unexercised at beginning of period (in shares) | shares	4.0
Granted (in shares) | shares	1.2
Exercised (in shares) | shares	(0.5)
Expired/forfeited (in shares) | shares	(0.3)
Balance unexercised at end of period (in shares) | shares	4.4
Vested or expected to vest (in shares) | shares	4.2
Exercisable (in shares) | shares	1.2
Weighted- average exercise price
Balance unexercised at beginning of period (in usd per share) | $ / shares	$ 127.08
Granted (in usd per share) | $ / shares	177.46
Exercised (in usd per share) | $ / shares	76.68
Expired/forfeited (in usd per share) | $ / shares	163.79
Balance unexercised at end of period (in shares) | $ / shares	143.57
Weighted-average exercise price, vested or expected to vest (in usd per share) | $ / shares	142.09
Weighted-average exercise price, exercisable (in usd per share) | $ / shares	$ 84.01
Stock options information [Abstract]
Weighted-average remaining contractual life (years), unexercised	7 years
Weighted-average remaining contractual life (years), vested or expected to vest	6 years 10 months 25 days
Weighted-average remaining contractual life (years), exercisable	3 years 3 months 19 days
Aggregate intrinsic value, unexercised | $	$ 225
Aggregate intrinsic value, vested or expected to vest | $	220
Aggregate intrinsic value, exercisable | $	$ 135

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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