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Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Auction Rate Securities
 
Fair Value Measurements [Line Items]  
Level 3 Financial Instruments, asset $ 108
Valuation Technique Discounted Cash Flows
Unobservable Input Credit risk premium Illiquidity premium Expected repayments [1],[2],[3]
Auction Rate Securities | Minimum
 
Fair Value Measurements [Line Items]  
Assumed repayment in years 2013
Auction Rate Securities | Maximum
 
Fair Value Measurements [Line Items]  
Assumed repayment in years 2036
Auction Rate Securities | Credit Risk Premium
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 1.00%
Auction Rate Securities | Illiquidity Premium
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 5.00%
EETC
 
Fair Value Measurements [Line Items]  
Level 3 Financial Instruments, asset 61
Valuation Technique Discounted Cash Flows
Unobservable Input Structure credit risk [4]
EETC | Structure Credit Risk | Minimum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 6.00%
Convertible Debt Derivative Asset
 
Fair Value Measurements [Line Items]  
Level 3 Financial Instruments, asset 413
Valuation Technique Binomial Lattice Model
Unobservable Input Expected volatility Own credit risk [5],[6]
Convertible Debt Derivative Asset | Expected Volatility
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, weighted average percentage 47.00%
Convertible Debt Derivative Asset | Expected Volatility | Minimum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 45.00%
Convertible Debt Derivative Asset | Expected Volatility | Maximum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 60.00%
Convertible Debt Derivative Asset | Own Credit Risk | Minimum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 6.00%
Convertible Debt Option Liability
 
Fair Value Measurements [Line Items]  
Level 3 Financial Instruments, liability $ (209)
Valuation Technique Binomial Lattice Model
Unobservable Input Expected volatility Own credit risk [5],[6]
Convertible Debt Option Liability | Expected Volatility
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, weighted average percentage 47.00%
Convertible Debt Option Liability | Expected Volatility | Minimum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 45.00%
Convertible Debt Option Liability | Expected Volatility | Maximum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 60.00%
Convertible Debt Option Liability | Own Credit Risk | Minimum
 
Fair Value Measurements [Line Items]  
Level 3 fair value measurements, percentage 6.00%
[1] Represents the credit risk premium component of the discount rate that the Company has determined market participants would use in pricing the investments.
[2] Represents the illiquidity premium component of the discount rate that the Company has determined market participants would use in pricing the investments.
[3] Represents the estimated timing of principal repayments used in the discounted cash flow model.
[4] Represents the credit risk premium of the EETC structure above the risk-free rate that the Company has determined market participants would use in pricing the instruments.
[5] Represents the range in volatility estimates that the Company has determined market participants would use when pricing the instruments.
[6] Represents the range of Company-specific risk adjustments that the Company has determined market participants would use as a model input.