Financing Arrangements and Derivative Financial Instruments - Fair Values for Foreign Currency Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivatives, net transaction gains	$ 79	$ 54
Accounts receivable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts receivable fair value, foreign currency contracts not designated as hedging instruments	10	20
Accounts receivable fair value, foreign currency contracts designated as cash flow hedging instruments	5	10
Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other current liabilities fair value, foreign currency contracts not designated as hedging instruments	(10)	(4)
Other current liabilities fair value, foreign currency contracts designated as cash flow hedging instruments	(1)	0
Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivatives, notional amount	1,094	878
Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivatives, notional amount	$ 168	$ 157