Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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)	1.90%	1.40%	1.40%
Expected volatility (as a percent)	22.50%	23.40%	25.20%
Expected dividend yield (as a percent)	1.70%	1.80%	2.00%
Adjustments for new accounting pronouncements
Provision for income taxes	$ (237)	$ (246)	$ (187)
Employee Stock Option
Stock Options
Term of options	10 years
Required service period	1 year
Period of vesting	3 years
Non-qualified options, granted	278	329
Stock option activity
Outstanding at the beginning of the period (in shares)	2,281
Granted (in shares)	278	329
Exercised (in shares)	(443)
Cancelled (in shares)	(21)
Outstanding at the end of the period (in shares)	2,095	2,281
Exercisable at the end of the period (in shares)	1,527
Share options, weighted average exercise price per share
Outstanding at the beginning of the period (in dollars per share)	$ 61.39
Granted (in dollars per share)	117.65
Exercised (in dollars per share)	46.16
Cancelled (in dollars per share)	87.50
Outstanding at the end of the period (in dollars per share)	71.81	$ 61.39
Exercisable at the end of the period (in dollars per share)	$ 59.14
Additional information pertaining to stock options
Options outstanding average remaining contractual life	5 years 10 months 13 days	5 years 11 months 5 days
Stock options exercisable average remaining contractual life	5 years 2 months 27 days
Options outstanding aggregate intrinsic value	$ 142	$ 145
Stock options exercisable aggregate intrinsic value	123
Cash received from exercise of stock options	20	$ 29	$ 21
Unrecognized compensation cost	$ 3
Weighted-average period for amortization of unrecognized compensation cost	1 year 6 months
Weighted average grant date fair value of stock options granted (per share)	$ 23.90	$ 18.73	$ 16.04
Total intrinsic value of stock options exercised	$ 35	$ 46	$ 27

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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Weighted average price of options that were either forfeited or expired.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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