v2.4.0.8
Schedule of Cash Taxes Paid (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Income taxes, net of amounts refunded $ 422 $ 351 $ 762
Employment taxes 1,282 1,308 1,328
Property and other taxes 2,082 1,727 1,883
Total $ 3,786 $ 3,386 $ 3,973