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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	7,200
Employee Stock Purchase Plan [Abstract]
Maximum contribution allowed under employee stock purchase plan as % of employee's earnings	15.00%
Total number of shares purchased under employee stock purchase plan	1,500
Plan period employee stock purchase plan, in months	3 months
Purchase price calculation for shares of stock under employee stock purchase plan	The purchase price for each share of stock is the lesser of 90% of the market price on the first day of the plan period or 100% of the market price on the last day of the plan period.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised in the period	$ 45	$ 45	$ 44
Proceeds from stock plans	59	$ 46	$ 45
Intrinsic value of options outstanding	$ 72
Weighted-average remaining contractual term of options exercisable	5 years 8 months 12 days
Intrinsic value of options exercisable	$ 48
Number of options exercisable	503	700	800
Weighted-average exercise price of exercisable options	$ 154.16	$ 134.94	$ 117.08
Options Vested and Expected to Vest [Abstract]
Number of options outstanding which are vested and expected to vest	1,100
Aggregate intrinsic value of outstanding options which are vested and expect to vest	$ 76
Weighted-average exercise price of outstanding options which are vested and expected to vest	$ 179.44
Weighted-average remaining contractual term of outstanding options which are vested and expected to vest	7 years
Unrecognized compensation costs on unvested options	$ 20
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation costs	1	$ 1	$ 1
Maximum [Member]
Non-Employee Stock Purchase Plan Awards [Abstract]
Incremental stock-based compensation cost due to acceleration of awards	$ 1	1	1
Restricted Stock Unit Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	119
Stock-based compensation costs	$ 15	$ 14	$ 16
Options Vested and Expected to Vest [Abstract]
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	3 years 4 months 24 days
Unvested Awards Roll Forward
Weighted-average grant date fair value per share of shares granted	$ 206.99
Unvested shares at end of period	271	260
Unrecognized compensation costs on unvested awards	$ 37
Performance Stock Unit Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	58	13	40
Stock-based compensation costs	$ 6	$ 7	$ 5
Options Vested and Expected to Vest [Abstract]
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	1 year 10 months 24 days
Unvested Awards Roll Forward
Weighted-average grant date fair value per share of shares granted	$ 190.45
Unvested shares at end of period	95	105
Unrecognized compensation costs on unvested awards	$ 9
Performance Stock Unit Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	0.00%
Performance Stock Unit Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights	200.00%
Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Granted	6	5	5
Stock-based compensation costs	$ 1	$ 1	$ 1
Unvested Awards Roll Forward
Weighted-average grant date fair value per share of shares granted	$ 229.67	$ 183.41	$ 194.73
Unvested shares at end of period	5
Equity Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Award expiration period	10 years
Options Vested and Expected to Vest [Abstract]
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	3 years 6 months
Employee Stock Purchase Plan of 2009 [Member] | Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan				900

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