Fair Value Measurements (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill	$ 7,092,000,000	$ 7,106,000,000	$ 7,111,000,000
Notional amount of foreign currency derivatives	34,000,000	355,000,000
Pre-tax net gain (loss) on foreign currency contracts		7,000,000	(8,000,000)
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment charges - nonrecurring	0	0	12,000,000
Goodwill impairment			12,000,000
Fair value | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			7,111,000,000
Total non-financial assets at fair value			7,111,000,000
Fair value measurements using quoted prices in active markets for identical assets (Level 1) | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Total non-financial assets at fair value			0
Fair value measurements using significant other observable inputs (Level 2) | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			0
Total non-financial assets at fair value			0
Fair value measurements using significant unobservable inputs (Level 3) | Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill			7,111,000,000
Total non-financial assets at fair value			$ 7,111,000,000