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Schedule of Share-Based Compensation Plan Cost (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | [1] | $ 70 | $ 58 | $ 114
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | [1] | 58 | 52 | 104
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | [1] | 11 | $ 6 | $ 10
Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost | [1] | $ 1 |  |
[1] | All compensation cost is recorded to Salaries and related costs, with the exception of $3 million in 2014 that was recorded in integration-related costs as a component of special items.

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