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Income Taxes - Components of Provision for Income Tax Expense (Benefit) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Continuing operations current provision/(benefit):                      
Federal                 $ 567 $ 474 $ 436
State                 47 27 38
Foreign                         
Total continuing operations current provision/(benefit)                 614 501 474
Continuing operations deferred provision/(benefit):                      
Federal                 142 23 (121)
State                 20 (26) (25)
Foreign                         
Total continuing operations deferred provision/(benefit)                 162 (3) (146)
Continuing operations provision for income tax expense/(benefit) 129 136 299 211 157 104 169 68 776 498 328
Discontinued operations current provision/(benefit):                      
Federal                 32 1 (49)
State                 1   (5)
Foreign                         
Total discontinued operations current provision/(benefit)                 33 1 (54)
Discontinued operations deferred provision/(benefit):                      
Federal                 (12) (2) 68
State                 (1)   6
Foreign                         
Total discontinued operations deferred provision/(benefit)                 (13) (2) 74
Discontinued operations provision for income tax expense/(benefit)                 20 (1) 20
Provision for income tax expense/(benefit)                 $ 796 $ 497 $ 348