Quarterly report pursuant to Section 13 or 15(d)

Activity in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)

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Activity in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Foreign currency translation gain (loss):
Jun. 30, 2013
Foreign currency translation gain (loss):
Dec. 31, 2013
Foreign currency translation gain (loss):
Dec. 31, 2012
Foreign currency translation gain (loss):
Jun. 30, 2014
Unrealized gain (loss) on marketable securities, net of tax:
Jun. 30, 2013
Unrealized gain (loss) on marketable securities, net of tax:
Dec. 31, 2013
Unrealized gain (loss) on marketable securities, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on marketable securities, net of tax:
Jun. 30, 2014
Unrealized gain (loss) on cash flow hedges, net of tax:
Jun. 30, 2013
Unrealized gain (loss) on cash flow hedges, net of tax:
Dec. 31, 2013
Unrealized gain (loss) on cash flow hedges, net of tax:
Dec. 31, 2012
Unrealized gain (loss) on cash flow hedges, net of tax:
Jun. 30, 2014
Accumulated Defined Benefit Plans Adjustment [Member]
Jun. 30, 2013
Accumulated Defined Benefit Plans Adjustment [Member]
Dec. 31, 2013
Accumulated Defined Benefit Plans Adjustment [Member]
Dec. 31, 2012
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]                                          
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (596) $ (3,577) $ (596) $ (3,577) $ (460) $ (123) $ (193) $ (126) $ 134 $ 1 $ (2) $ (1) $ 6 $ (260) $ (228) $ (219) $ (286) $ (214) $ (3,154) $ (114) $ (3,208)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax           0 (161)                            
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 39 (24) 3 (327)   3 (166)                            
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax                   0 0                    
Aggregate adjustment for the period, tax           3 3                            
Current period changes in fair value, tax effect                   1 (5)                    
Reclassification to earnings, tax effect                   0 0                    
Current period changes in fair value, tax effect                           (27) (14)            
Reclassification to earnings, tax effect                           1 48            
Reclassification to earnings, tax effect                                   430 34    
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax                                   $ (488) $ 0