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Equity-Based Compensation - Stock Options (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable shares, end of year	2,269
Exercisable, weighted average per share exercise price	$ 46.86
Exercise of common stock options	$ 52	$ 95	$ 63
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of awards	10 years
Outstanding shares, beginning of year	4,885
Granted, shares	779
Exercised, shares	(1,125)
Forfeited or expired, shares	(98)
Outstanding shares, end of year	4,441	4,885
Exercisable shares, end of year	2,269
Outstanding, Weighted Average Per Share Fair Value, beginning of year	$ 53.46
Granted, Weighted Average Per Share Fair Value	85.34
Exercised, Weighted Average Per Share Fair Value	50.64
Forfeited or expired, Weighted Average Per Share Fair Value	67.53
Outstanding, Weighted Average Per Share Fair Value, end of year	59.46	$ 53.46
Exercisable, weighted average per share exercise price	$ 46.86
Weighted average remaining contractual term of stock options outstanding	6 years 4 months 24 days
Aggregate intrinsic value of stock options outstanding based on the market value of company's common stock	$ 131
Aggregate intrinsic value of stock options exercisable based on the market value of company's common stock	96
Exercise of common stock options	52	$ 95	63
Aggregate intrinsic value of stock options exercised	$ 41	$ 71	$ 67
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 stock options granted under share-based compensation arrangement.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Number of options outstanding, including both vested and non-vested options.

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