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Equity - Stock options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock options, Number of Options
Outstanding at the beginning of the period (in shares)	2,095
Granted (in shares)	215	278
Exercised (in shares)	(209)	(443)	(636)
Cancelled (in shares)	(22)
Outstanding at the end of the period (in shares)	2,079	2,095
Exercisable at the end of the period (in shares)	1,599
Stock options, Weighted Average Exercise Price per Share
Outstanding at the beginning of the period (in dollars per share)	$ 71.81
Granted (in dollars per share)	133.61
Exercised (in dollars per share)	48.50
Cancelled (in dollars per share)	99.81
Outstanding at the end of the period (in dollars per share)	80.25	$ 71.81
Exercisable at the end of the period (in dollars per share)	$ 67.85
Additional information pertaining to stock options
Average Remaining Contractual Term, Outstanding	5 years 6 months 4 days	5 years 10 months 13 days
Average Remaining Contractual Term, Exercisable	4 years 8 months 5 days
Aggregate Intrinsic Value, Outstanding (in dollars)	$ 42	$ 142
Aggregate Intrinsic Value, Exercisable (in dollars)	42
Cash received from exercise of stock options	$ 10	$ 20	$ 29
Weighted average grant date fair value of stock options granted (per share)	$ 24.01	$ 23.90	$ 18.73
Total intrinsic value of stock options exercised	$ 15	$ 35	$ 46
Employee Stock Option
Share-based compensation
Term of award	10 years
Period of vesting	3 years
Required service period	1 year
Assumptions used to measure the fair value of awards
Expected life	5 years 6 months	5 years 6 months	5 years 6 months
Risk-free interest rate (as a percent)	2.50%	1.90%	1.40%
Expected volatility (as a percent)	19.80%	22.50%	23.40%
Expected dividend yield (as a percent)	1.80%	1.70%	1.80%
Additional information pertaining to stock options
Unrecognized compensation cost	$ 3
Weighted-average period for amortization of unrecognized compensation cost	1 year 9 months 18 days

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