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Summary Of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Retirement Benefits [Abstract]      
Defined Benefit Plan, Benefit Obligation $ 779 $ 720 $ 656
Employee Benefit Plans [Abstract]      
Service cost 5 4 5
Interest cost 19 21 22
Expected return on plan assets (30) (27) (31)
Defined Benefit Plan Amortization Of Unrecognized Amounts 8 5 5
Net periodic benefit cost 2 3 1
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) (15) (115)  
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) 44 (53)  
Defined Benefit Plan, Fair Value of Plan Assets 614 523 $ 527
Actual return on plan assets 59 60  
Employer contributions 24 12  
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) $ 32 $ (53)