v3.7.0.1
Changes in Balances of Accumulated Other Comprehensive Income by Component (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 $ 24,032
Net other comprehensive income (loss) (64)
Balance at March 31, 2017 25,037
Foreign currency translation adjustments  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 (713)
Other comprehensive income 77
Net other comprehensive income (loss) 77
Balance at March 31, 2017 (636)
Unrealized loss on cash flow hedges  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 (80)
Other comprehensive income 83
Amounts reclassified to net income (101)
Net other comprehensive income (loss) (18)
Balance at March 31, 2017 (98)
Unrealized gain on marketable securities  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 46
Other comprehensive income 6
Amounts reclassified to net income 8
Net other comprehensive income (loss) 14
Balance at March 31, 2017 60
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 (137)
Net other comprehensive income (loss) (137)
Balance at March 31, 2017 3,283
Accumulated Other Comprehensive Income  
Equity And Accumulated Other Comprehensive Income [Line Items]  
Balance at January 1, 2017 2,673
Other comprehensive income 166
Amounts reclassified to net income (230)
Net other comprehensive income (loss) (64)
Balance at March 31, 2017 $ 2,609