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Retirement and Deferred Compensation Plans - Components of Net Periodic Cost and Underlying Weighted Average Actuarial Assumptions Used for Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits [Member]      
Component of Net Periodic Benefit Costs      
Service cost $ 5 $ 5 $ 5
Interest cost 8 9 7
Pension Benefits [Member] | Periodic Cost [Member]      
Component of Net Periodic Benefit Costs      
Service cost 5 5 5
Interest cost 8 9 7
Expected return on assets (8) (11) (8)
Amortization of actuarial (gain) loss 2 1 2
Net periodic benefit cost $ 7 $ 4 $ 6
Weighted Average Assumptions used to determine Net Period Benefit Cost for the Years ended December 31      
Discount rate 3.70% 4.60% 4.30%
Salary increases 4.60% 4.90% 4.60%
Expected return on assets 3.90% 5.60% 4.70%
Postretirement Benefits [Member]      
Component of Net Periodic Benefit Costs      
Service cost $ 2 $ 3 $ 4
Interest cost $ 1 $ 1 $ 1
Healthcare cost trend      
Initial 7.00% 7.00% 7.00%
Ultimate in 2025 5.00% 5.00% 5.00%
Postretirement Benefits [Member] | Periodic Cost [Member]      
Component of Net Periodic Benefit Costs      
Service cost $ 2 $ 3 $ 4
Interest cost 1 1 1
Curtailment (gain) loss     (3)
Net periodic benefit cost $ 3 $ 4 $ 2
Weighted Average Assumptions used to determine Net Period Benefit Cost for the Years ended December 31      
Discount rate 3.62% 4.33% 3.43%
Healthcare cost trend      
Initial 7.00% 7.00% 7.25%
Ultimate in 2025 5.00% 5.00% 5.00%