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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Jan. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 50	$ 35	$ 45
Tax benefit related to the share-based compensation expense		$ 6	5	13
Stock options granted		0
Number of shares authorized		10,420,826
Aggregate fair value of options vested		$ 5	$ 6	$ 9
Weighted-average grant date fair value of the options granted			$ 2.16	$ 4.70
Intrinsic value of options exercised			$ 6	$ 17
Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		7,200,000
2010 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized		3,220,826
2016 Employee Share Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized					2,000,000
Shares issued under the ESPP		201,637	174,246	159,279
Time-based stock options \| Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		0	750,000	1,000
Vesting period			3 years	4 years
Vesting description			33.3% per year	6.25% per quarter
Vesting rate			33.30%	6.25%
Stock option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unearned share-based compensation related to stock options		$ 1
Unearned share-based compensation, expected period to recognize		2 years
Time and Performance Based Stock Options \| Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted		0	2,524,176	0
Vesting period		3 years
Vesting rate		33.30%
Unearned share-based compensation related to stock options		$ 1
Unearned share-based compensation, expected period to recognize		2 years
Weighted-average grant date fair value of the options granted			$ 3.09
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unearned share-based compensation, expected period to recognize		2 years 9 months 18 days
Weighted-average grant date fair value of the options granted		$ 21.46	$ 25.35	$ 36.23
Restricted stock units granted		2,454,871	2,780,914	1,574,973
Unearned stock-based compensation of RSUs		$ 51
Restricted Stock Units (RSUs) \| Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock units granted	31,381
Aggregate fair value of restricted stock units granted	$ 2
Aggregate fair value of restricted stock units granted attributed to post merger service	1
Aggregate fair value of restricted stock units granted included in purchase consideration	$ 1
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Vesting description		6.25% per quarter
Vesting rate		6.25%
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan \| Over Four Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Vesting rate		25.00%
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan \| Over Two Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		2 years
Vesting rate		12.50%
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan \| Limited Group Of Senior Executives \| First Anniversary Date of Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate		25.00%
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan \| Limited Group Of Senior Executives \| Second Anniversary Date of Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate		75.00%
Restricted Stock Units (RSUs) \| 2019 Stock Incentive Plan \| Limited Group Of Senior Executives \| End of Second Anniversary Date of Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate		100.00%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Vesting description		6.25% per quarter
Vesting rate		6.25%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan \| Limited Group Of Senior Executives \| Second Anniversary Date of Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate		100.00%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan \| Limited Group Of Senior Executives \| Over Three Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
Vesting rate		33.30%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan \| Limited Group Of Senior Executives \| Third Anniversary Date Of Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rate		100.00%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan \| Limited Group Of Senior Executives \| Over Four Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Vesting rate		25.00%
Restricted Stock Units (RSUs) \| 2018 Stock Incentive Plan \| Limited Group Of Senior Executives \| Over Two Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		2 years
Vesting rate		12.50%
Restricted Stock Units (RSUs) \| 2017 Stock Incentive Plan \| Limited Group Of Senior Executives \| Over Four Years on Anniversary Date
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
Vesting rate		25.00%
Performance restricted stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		3 years
Unearned stock-based compensation of RSUs		$ 6
Number of Options, Granted		523,508	463,442	348,885
Weighted-Average Exercise Price, Granted		$ 24.62	$ 27.94	$ 37.88
Share based compensation arrangement required service period, years		3 years	3 years	3 years
Revenue compounded annual growth rate, Percentage		50.00%	25.00%
Relative shareholder return, percentage			25.00%	40.00%
Adjusted earnings per share, percentage		50.00%
Free cash flow achievement, percentage			50.00%	60.00%
Maximum payout, percentage		200.00%