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Fair Value (Narrative) (Details)
$ in Millions
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Fair Value Disclosures [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0  
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0  
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 119 $ 96
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | item 329 300
CVR-related legal liability $ 0  
Available-for-sale Securities [Member]    
Fair Value Disclosures [Line Items]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held 5  
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Disclosures [Line Items]    
Property, Plant, and Equipment, Fair Value Disclosure 202  
Interest Rate Swap [Member]    
Fair Value Disclosures [Line Items]    
Credit risk valuation adjustment, decrease in fair value of liability 4 $ 4
Credit risk valuation adjustment, decrease in fair value of liability, net of tax $ 2 $ 2