Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Equity securities	$ 110	$ 15
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency hedges, assets at fair value	54	75
Interest rate hedges, assets at fair value	42	67
Equity securities	110	15
Total assets	223	224
Foreign currency hedges, liabilities at fair value	8	16
Interest rate hedges, liabilities at fair value		21
Contingent payments related to acquisitions, liabilities at fair value	344	86
Total liabilities	352	123
Fair Value, Measurements, Recurring | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt securities		51
Fair Value, Measurements, Recurring | Foreign Government Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt securities	17	16
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Equity securities	110	15
Total assets	110	15
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency hedges, assets at fair value	54	75
Interest rate hedges, assets at fair value	42	67
Total assets	113	158
Foreign currency hedges, liabilities at fair value	8	16
Interest rate hedges, liabilities at fair value		21
Total liabilities	8	37
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Government Debt Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt securities	17	16
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets		51
Contingent payments related to acquisitions, liabilities at fair value	344	86
Total liabilities	344	86
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Preferred Stock
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt securities		$ 51