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Summary Of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 6 | $ 5 | $ 4
Interest cost | 19 | 19 | 21
Expected return on plan assets | (33) | (30) | (27)
Defined Benefit Plan Amortization Of Unrecognized Amounts | 7 | 8 | 5
Net periodic benefit cost | (1) | 2 | 3
Employee Benefit Plans [Abstract] |  |  |
Defined Benefit Plan, Benefit Obligation | 722 | 779 | 720
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 32 | (15) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | (24) | 44 |
Defined Benefit Plan, Plan Assets, Amount | 549 | 614 | $ 523
Actual return on plan assets | (29) | 59 |
Employer contributions | 11 | 24 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | (21) | $ 32 |
Operating Expense [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 4 |  |
Selling, General and Administrative Expenses [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 2 |  |

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