Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency hedges, assets at fair value	$ 42	$ 56
Foreign currency hedges, liabilities at fair value	3	2
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency hedges, assets at fair value	9	10
Interest rate hedges, assets at fair value	33	46
Available-for-sale securities	1,242	5,162
Total assets	1,284	5,218
Foreign currency hedges, liabilities at fair value	3	2
Contingent payments related to acquisitions	20	20
Total liabilities	23	22
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	10	14
Total assets	10	14
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency hedges, assets at fair value	9	10
Interest rate hedges, assets at fair value	33	46
Available-for-sale securities	1,232	5,148
Total assets	1,274	5,204
Foreign currency hedges, liabilities at fair value	3	2
Total liabilities	3	2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent payments related to acquisitions	20	20
Total liabilities	$ 20	$ 20