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Equity (Treasury Stock) - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 12, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Apr. 12, 2016 | Sep. 30, 2015 | Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Payments for repurchase of common stock |  |  |  | $ 182,000,000 |  |  |  |
Accelerated Share Repurchase Agreement [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  |  | 25,700,000 |  |  |  |  |
Value of treasury stock acquired, cost method |  |  | $ 600,000,000 |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  | 750,000,000 |  |  |  | $ 750,000,000 |
Payments for repurchase of common stock |  |  | 750,000,000 |  |  |  |  |
Accelerated stock repurchases not yet settled |  |  | 150,000,000 |  |  |  |  |
Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired | 9,400,000 |  |  |  |  |  |  |
2013 Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  |  |  |  |  | $ 500,000,000
2013 Repurchase Program And Open Market Repurchases [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  |  |  | 14,300,000 |
Value of treasury stock acquired, cost method |  |  |  |  |  |  | $ 406,500,000 |
2015 Repurchase Program [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  | $ 1,250,000,000 |  |  |  | $ 1,250,000,000 |
2015 Repurchase Program And Open Market Purchases [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  | 19,200,000 |  |  |
Value of treasury stock acquired, cost method |  |  |  |  | $ 449,900,000 |  |  |
2015 Repurchase Plan Open Market Purchases And Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  |  |  |  |  | 54,300,000 |  |
Value of treasury stock acquired, cost method |  |  |  |  |  | $ 1,200,000,000 |  |
Treasury stock remaining authorized repurchase amount | $ 50,100,000 |  |  |  |  | $ 50,100,000 |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities [Member] | Treasury Stock [Member] |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  | 345,965 |  | 328,358 |  |  |  |
Value of treasury stock acquired, cost method |  | $ 7,100,000 |  | $ 9,500,000 |  |  |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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