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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of foreign currency contracts $ 1  
Recurring Basis [Member]    
Assets:    
Cash equivalents 56 $ 104
Interest rate swaps 0 2
Total assets 56 106
Liabilities:    
Interest rate swaps 16 11
Total liabilities 16 11
Recurring Basis [Member] | Level 1 [Member]    
Assets:    
Cash equivalents 56 104
Interest rate swaps 0 0
Total assets 56 104
Liabilities:    
Interest rate swaps 0 0
Total liabilities 0 0
Recurring Basis [Member] | Level 2 [Member]    
Assets:    
Cash equivalents 0 0
Interest rate swaps 0 2
Total assets 0 2
Liabilities:    
Interest rate swaps 16 11
Total liabilities $ 16 $ 11