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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, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
     
Component of Net Periodic Benefit Costs      
Service cost $ 5 $ 5 $ 5
Interest cost 7 7 7
Expected return on assets (7) (8) (8)
Amortization of actuarial gain (loss) 1   1
Net periodic benefit cost 6 4 5
Weighted Average Assumptions used to determine Net Periodic Benefit Costs for the Years ended December 31      
Discount rate 4.70% 5.40% 5.70%
Salary increases 4.60% 5.00% 5.30%
Expected return on assets 4.85% 6.25% 6.65%
Postretirement Benefits [Member]
     
Component of Net Periodic Benefit Costs      
Service cost 4 3 2
Interest cost 1 1 1
Net periodic benefit cost $ 5 $ 4 $ 3
Weighted Average Assumptions used to determine Net Periodic Benefit Costs for the Years ended December 31      
Discount rate 4.04% 4.93% 5.56%
Healthcare cost trend      
Initial 7.25% 7.50% 8.00%
Ultimate in 2017 5.00% 5.00% 5.00%