Defined Benefit Plans with Assets Exceeding Benefit Obligations and Benefit Obligations Exceeding Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets Exceeding Benefit Obligations [Member]
Schedule Of Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Line Items]
Projected benefit obligation	$ 194
Accumulated benefit obligation	194
Fair value of plan assets	200
Benefit Obligations Exceeding Assets [Member]
Schedule Of Pension Plans With Accumulated Benefit Obligations In Excess Of Plan Assets [Line Items]
Projected benefit obligation	27	256
Accumulated benefit obligation	27	256
Fair value of plan assets		$ 185