Share Repurchase Transactions and Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2020	Jan. 31, 2019
Repurchase of common stock, shares	8,477,000
Repurchase price of common stock, per share	$ 180.11
Board of Directors Chairman [Member]
Share repurchase program authorized amount	$ 7,274	$ 6,000	$ 4,000	$ 2,000

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