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Schedule of Details of Dividend Payments (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended
--- | --- | ---
Jul. 02, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |  |  |  |  |
Record Date |  | Mar. 31, 2016 | Dec. 30, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Payment Date |  | Apr. 29, 2016 | Jan. 29, 2016 | Oct. 30, 2015 | Jul. 31, 2015 | Apr. 24, 2015 | Jan. 30, 2015
Amount per Share |  | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.28 | $ 0.28
Total Amount |  | $ 43 | $ 43 | $ 43 | $ 43 | $ 42 | $ 42
Maximum dividend allowed prior to merger | $ 0.29 |  |  |  |  |  |

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