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Equity-Based Compensation - Stock Options (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable shares, end of year	1,672,000
Exercisable, Weighted Average Per Share Exercise Price	$ 74.08
Exercise of common stock options	$ 66	$ 63	$ 67
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards	10 years
Outstanding shares, beginning of year	3,543
Granted, shares	661
Exercised, shares	(962)
Forfeited or expired, shares	(36)
Outstanding shares, end of year	3,206	3,543
Exercisable shares, end of year	1,672
Outstanding, Weighted Average Per Share Fair Value, beginning of year	$ 82.86
Granted, Weighted Average Per Share Fair Value	110.81
Exercised, Weighted Average Per Share Fair Value	68.89
Forfeited or expired, Weighted Average Per Share Fair Value	109.50
Outstanding, Weighted Average Per Share Fair Value, end of year	92.53	$ 82.86
Exercisable, Weighted Average Per Share Exercise Price	$ 74.08
Weighted average remaining contractual term of stock options outstanding	6 years 7 months 6 days
Aggregate intrinsic value of stock options outstanding based on the market value of company's common stock	$ 238
Aggregate intrinsic value of stock options exercisable based on the market value of company's common stock	155
Exercise of common stock options	66	$ 63	67
Aggregate intrinsic value of stock options exercised	$ 66	$ 58	$ 71
First Anniversary [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)	25.00%
Second Anniversary [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)	25.00%
Third Anniversary [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting (as a percent)	50.00%

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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