Stockholders' Equity - Additional Information (Detail)					2 Months Ended		12 Months Ended					47 Months Ended
	Feb. 20, 2020 shares	Dec. 18, 2019 USD ($) $ / shares shares	Jan. 29, 2019 shares	Dec. 14, 2018 USD ($) $ / shares shares	Feb. 20, 2020 $ / shares	Jan. 29, 2019 $ / shares	Dec. 31, 2019 USD ($) transaction shares		Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares		Dec. 31, 2019 USD ($) shares		Oct. 22, 2019 USD ($)
Class of Stock [Line Items]
Shares acquired (in shares) | shares		1,431,989	117,751	1,057,035
Shares acquired							$ 2,523,493,000	[1]	$ 1,870,584,000			$ 2,523,493,000	[1]
Repurchase of common stock							694,909,000		958,696,000	$ 402,393,000
Repurchase of common stock							$ 694,909,000	[2]	$ 958,696,000	$ 402,393,000	[3]
Initial price paid (in usd per share) | $ / shares		$ 285.70		$ 176.91
Final price paid (in usd per share) | $ / shares						$ 187.27
Number of transactions | transaction							2
Repurchase agreements
Class of Stock [Line Items]
Shares acquired (in shares) | shares												11,119,657
Repurchase of common stock												$ 2,200,000,000
Repurchase of common stock		$ 500,000,000		$ 220,000,000
Common Stock
Class of Stock [Line Items]
Increase in authorized amount of repurchases														$ 1,000,000,000
Aggregate authorized repurchase amount														$ 3,100,000,000
Shares acquired (in shares) | shares							2,094,115		4,911,438	2,854,959
Shares acquired							$ 603,800,000		$ 958,700,000	$ 402,400,000		603,800,000
Remaining authorized repurchase amount							857,000,000					857,000,000
Common Stock | Repurchase agreements
Class of Stock [Line Items]
Aggregate authorized repurchase amount		$ 500,000,000		$ 220,000,000			$ 500,000,000					$ 500,000,000
Subsequent Event
Class of Stock [Line Items]
Shares acquired (in shares) | shares	175,340
Final price paid (in usd per share) | $ / shares					$ 306.81

[1] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019, using a modified retrospective transition method. Under this method, financial results reported in periods prior to 2019 are unchanged. Refer to footnote 14.

[2] Reflects the impact of the Company's adoption of ASU 2016-02 "Leases", on January 1, 2019 using the modified retrospective transition method. The adoption of the Leases guidance resulted in an adjustment to other assets, other current liabilities and other noncurrent liabilities in our consolidated balance sheet for the cumulative effect of applying the standard. Financial results reported in periods prior to 2019 are unchanged.

[3] Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the statement of cash flows.