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Summary of Changes in AOCI by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Currency translation adjustment, Beginning Balance $ (3,191) $ (2,323)
Currency translation adjustment, other comprehensive income (loss) before reclassifications 92 (1,138)
Currency translation adjustment, amounts reclassified from AOCI [1] 0 0
Currency translation adjustment, net other comprehensive (loss) income 92 (1,138)
Currency translation adjustment, Ending Balance (3,099) (3,461)
Pension and other employee benefit, Beginning Balance (1,064) (1,427)
Pension and other employee benefit, Other comprehensive income (loss) before reclassifications (1) 33
Pension and other employee benefit, Amounts reclassified from AOCI [1],[2] 22 35
Pension and other employee benefit, Net other comprehensive (loss) income 21 68
Pension and other employee benefit, Ending Balance (1,043) (1,359)
Hedging activities, Beginning Balance 7 34
Hedging activities, Other comprehensive income (loss) before reclassifications (3) 6
Hedging activities, Amounts reclassified from AOCI [1],[2] (3) (16)
Hedging activities, Net other comprehensive income (loss) (6) (10)
Hedging activities, Ending Balance 1 24
Available-for-sale securities, Beginning Balance 4,472 66
Available-for-sale securities, Other comprehensive income (loss) before reclassifications 22 14
Available-for-sale securities, Amounts reclassified from AOCI [1],[2] (3,388) 7
Available-for-sale securities, Net other comprehensive (loss) income (3,366) 21
Available-for-sale securities, Ending Balance 1,106 87
Total, Beginning Balance 224 (3,650)
Total, Other comprehensive income (loss) before reclassifications 110 (1,085)
Total, Amounts reclassified from AOCI [1],[2] (3,369) 26
Total other comprehensive income (loss), net of tax (3,259) (1,059)
Total, Ending Balance $ (3,035) $ (4,709)
[1] See table below for details about these reclassifications.
[2] Amounts in parentheses indicate reductions to net income.