Share Repurchase Transactions and Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2020	Sep. 30, 2020	Jan. 31, 2020	Jan. 31, 2019
Share repurchase program authorized amount			$ 2,000	$ 2,000
Repurchase of common stock, shares	3,287
Repurchase price of common stock, per share	$ 134.18
Board of Directors Chairman [Member]
Share repurchase program authorized amount			$ 4,000	$ 2,000
Share repurchase program, remaining authorized repurchase amount		$ 2,800

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Name:	us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration