Stockholders' Equity (Narrative) (Detail) - USD ($) shares in Millions	3 Months Ended
Mar. 31, 2022	Aug. 31, 2021
Equity [Abstract]
Stock repurchase program, authorized amount (up to)		$ 5,100,000,000
Net activity related to restricted stock units (in shares)	6.4
Share repurchased during period	$ 1,300,000,000
Remaining authorized repurchase amount	$ 652,000,000

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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 Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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