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Stockholders' Equity (Deficit) - Repurchase of Common Stock (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | May 02, 2018 | Nov. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2015 | Jul. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Treasury stock value |  | $ 571,700,000 | $ 1,302,100,000 | $ 217,000,000 |  |  |  |  |
Common stock in treasury, shares |  | 75,964,667 | 61,485,423 | 34,156,355 |  |  |  | 29,612,337 |
July 2015 Repurchase Program |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 1,500,000,000.0
Stock repurchase program, additional authorized amount |  |  |  |  | $ 1,000,000,000.0 |  | $ 1,500,000,000.0 |  |
Number of common stock shares repurchased (in shares) |  | 14,898,454 |  |  |  |  |  |  |
Treasury stock value |  | $ 651,400,000 |  |  |  |  |  |  |
Common stock repurchase (price per share) |  | $ 43.72 |  |  |  |  |  |  |
Common Stock Repurchase Set Two | Share Trading Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Number of common stock shares repurchased (in shares) |  |  | 27,320,816 |  |  |  |  |  |
Treasury stock value |  |  | $ 1,200,000,000 |  |  |  |  |  |
Common stock repurchase (price per share) |  |  | $ 45.44 |  |  |  |  |  |
Common Stock Repurchase Set One | Share Trading Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Number of common stock shares repurchased (in shares) |  | 13,678,818 |  |  |  |  |  |  |
Treasury stock value |  | $ 571,400,000 |  |  |  |  |  |  |
Common stock repurchase (price per share) |  | $ 41.77 |  |  |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 400,000,000.0 |  |  | $ 400,000,000.0 |  |  |
Treasury stock value |  |  | $ 320,000,000 |  |  |  |  |  |
Common stock repurchase (price per share) | $ 48.14 |  |  |  |  |  |  |  |
Common stock in treasury, shares | 8,308,692 |  | 7,089,056 |  |  |  |  |  |

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