Stockholders' Equity (Narrative) (Detail) shares in Millions, $ in Millions	3 Months Ended	17 Months Ended
Mar. 31, 2022 USD ($) shares	Mar. 31, 2022 USD ($) shares
Equity [Abstract]
Stock repurchase program, authorized amount	$ 600	$ 600
Remaining authorized amount under stock repurchase program	$ 335	$ 335
Common stock repurchased, shares \| shares	1.6	4.4
Purchase of Company, value	$ 108	$ 265

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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