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Pension Plans, Other Postretirement Benefits, and Defined-Contribution Plans - Expected Benefit Payments Table (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Pension Plans, Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2014 $ 139
2015 148
2016 163
2017 185
2018 181
2019-2023 1,065
Other Postretirement Benefit Plans, Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
2014 15
2015 16
2016 16
2017 17
2018 18
2019-2023 $ 98