v3.7.0.1
Changes in Balances of Accumulated Other Comprehensive Income by Component (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2017
USD ($)
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 $ 24,032
Net other comprehensive income (loss) (389)
Balance at June 30, 2017 26,761
Foreign currency translation adjustments  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 (713)
Other comprehensive income 88
Net other comprehensive income (loss) 88
Balance at June 30, 2017 (625)
Unrealized loss on cash flow hedges  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 (80)
Other comprehensive income 331
Amounts reclassified to net income (529)
Net other comprehensive income (loss) (198)
Balance at June 30, 2017 (278)
Unrealized loss on marketable securities  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 46
Other comprehensive income 13
Amounts reclassified to net income (19)
Net other comprehensive income (loss) (6)
Balance at June 30, 2017 40
Defined benefit pension and postretirement plans  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 3,420
Amounts reclassified to net income (273)
Net other comprehensive income (loss) (273)
Balance at June 30, 2017 3,147
Accumulated Other Comprehensive Income  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 2,673
Other comprehensive income 432
Amounts reclassified to net income (821)
Net other comprehensive income (loss) (389)
Balance at June 30, 2017 $ 2,284