Pensions And Other Postemployment Benefits (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Future Amortization of Gain (Loss)	$ 15
Pensions and other postemployment benefits liability (Note 15)	1,123	$ 1,282
OPEB curtailment gain	0	0	$ 19
Accumulated benefit obligation for all pension plans	1,669	1,809
Contribution expense for the eligible employees	$ 45	45	42
Document Period End Date	Dec. 31, 2015
Amount contributed to defined contribution pension plans	$ 1
Current portion of postemployment benefit liability	$ 40	$ 46
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average long-term rate of return on assets	5.70%	6.60%
OPEB curtailment gain	$ 0	$ 0	0
Company contribute to its pension plans	37
Other Postemployment Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Pensions and other postemployment benefits liability (Note 15)	59	60
OPEB curtailment gain	0	0	19
Prior service cost (credit)	(10)	(14)
Current portion of postemployment benefit liability	26	25
Amounts contributed to defined contribution pension plans	20	$ 25
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribute to its pension plans	$ 2
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average long-term rate of return on assets	3.20%	3.50%
OPEB curtailment gain	$ 2	$ 0	0
Company contribute to its pension plans	$ 33
Other Postretirement Benefits - U.S. Welfare Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
OPEB curtailment gain			38
United States Postretirement Benefit Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
OPEB curtailment gain			19
Multiemployer Plans, Pension [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Amounts contributed to defined contribution pension plans		1	1
Multiemployer Plans, Pension [Member] | Italy [Member]
Defined Benefit Plan Disclosure [Line Items]
Amounts contributed to defined contribution pension plans		1	1
Multiemployer Plans, Pension [Member] | FRANCE
Defined Benefit Plan Disclosure [Line Items]
Amounts contributed to defined contribution pension plans		$ 1	$ 1
Hedge Funds [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average Percentage of Company's asset allocation	16.00%
Defined benefit plan, target plan asset allocations	25.00%
Fixed Income Investments [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average Percentage of Company's asset allocation	23.00%
Defined benefit plan, target plan asset allocations	25.00%
Fixed Income Investments [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations	25.00%
Equity Securities [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average Percentage of Company's asset allocation	61.00%
Defined benefit plan, target plan asset allocations	50.00%
Equity Securities [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations	5.00%
Investment Fund [Member] | U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted average Percentage of Company's asset allocation	73.00%
Insurance Contract [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations	70.00%