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Equity - Treasury Stock (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 20 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 01, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Feb. 28, 2017 | Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock, value |  | $ 35,823,000 |  |  |  | $ 35,823,000 |  | $ 14,288,000 |  |
Retirement of treasury stock, shares (in shares) | 84,800,000 |  |  |  |  |  |  |  |  |
Retirement of treasury stock, amount |  |  |  |  |  |  |  | $ 1,950,000,000 |  |
2017 Repurchase Program |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  |  |  | 0 |  |  |  |
2017 Repurchase Program | Maximum |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  |  |  |  |  |  |  | $ 300,000,000
2015 Repurchase Plan Open Market Purchases And Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  |  |  | 0 | 0 |  | 54,300,000 |
Treasury stock acquired, value |  |  |  |  |  |  |  |  | $ 1,200,000,000 |
2015 Repurchase Program | Maximum |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  | $ 1,250,000,000.00 |  |  |  |  |  |
2015 Repurchase Program Open Market Purchases |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  |  | 19,200,000 |  |  |  |  |
Treasury stock acquired, value |  |  |  |  | $ 449,900,000 |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  | 25,700,000 |  |  |  | 9,400,000 |  |
Treasury stock acquired, value |  |  |  | $ 600,000,000 |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  | 750,000,000.0 |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  | 750,000,000 |  |  |  |  |  |
Accelerated stock repurchases settled at a later date |  |  |  | $ 150,000,000 |  |  |  |  |  |
Treasury Stock Associated with Deferred Compensation Plans |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, value |  | 0 | $ 300,000 |  |  | $ 3,400,000 | $ 8,200,000 |  |  |
Treasury stock, value |  | $ 17,700,000 |  |  |  | $ 17,700,000 |  |  |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Treasury stock acquired (in shares) |  |  |  |  |  | 500,000 | 400,000 |  |  |
Treasury stock acquired, value |  |  |  |  |  | $ 18,200,000 | $ 7,500,000 |  |  |

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