Derivative Financial Instruments and Hedge Activities (Additional Information) (Detail) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 EUR (€)	Jul. 30, 2012 USD ($)	Jun. 30, 2012 Settlement Date March Fifteen Twenty Thirteen [Member] USD ($)	Dec. 31, 2011 Settlement Date March Fifteen Twenty Thirteen [Member] USD ($)	Jun. 30, 2012 Settlement Date March Fifteen Twenty Eighteen [Member] USD ($)	Dec. 31, 2013 Settlement Date 15 March 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Foreign Currency Fair Value Hedge Derivatives	$ 28		$ 56
Notional Amount of Nonderivative Instruments Designated as Net Investment Hedges				300
Debt Instrument, Convertible, Remaining Discount Amortization Period	24 months		21 months
Investment Contract Settlement Date Range End	Dec. 31, 2015		Sep. 30, 2014
Foreign Currency Fair Value Hedge Derivative at Fair Value, Net	1		3
Debt Conversion, Converted Instrument, Amount		445
Proceeds Termination Interest Rate Swap	0	29	19
Forward Contract Indexed to Issuer's Equity, Indexed Shares		1,388,889
Forward Contract Indexed To Issuers Equity Shares Principal Amount	62
Forward Contract Indexed To Issuers Equity Fair Value	207	130
Foreign Currency Contracts, Liability, Fair Value Disclosure	(8)		1
Notional Amount of Interest Rate Cash Flow Hedge Derivatives					400
Derivative, Cash Paid on Settlement of Hedge					121
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(104)
Notional Amount of Derivative Instruments Designated as Net Investment Hedges			1,160			600	600
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives								1	560
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value, Net	120	95
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	$ (35)	$ 9