Quarterly report pursuant to Section 13 or 15(d)

Assets And Liabilities Measured At Fair Value (Details)

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Assets And Liabilities Measured At Fair Value (Details) - USD ($)
 1 Months Ended 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2016
Mar. 31, 2015
Oct. 17, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized and unrealized gains (losses) on financial instruments, net       $ (8,000,000) $ (28,000,000)  
Payments for (Proceeds from) Derivative Instrument, Investing Activities         17,000,000  
1.375% Cash Convertible Senior Notes due 2023            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Debt face amount           $ 1,000,000,000
1.375% Cash Convertible Senior Notes due 2023 | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Debt face amount           $ 1,000,000,000
Fair Value Option Securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized and unrealized gains (losses) on financial instruments, net       24,000,000 (31,000,000)  
Convertible Notes Payable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized and unrealized gains (losses) on financial instruments, net       (3,000,000)    
1.375% Convertible Notes Bond Hedge Transaction            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized and unrealized gains (losses) on financial instruments, net       (28,000,000) 8,000,000  
Other Financial Instruments            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Realized and unrealized gains (losses) on financial instruments, net       $ (1,000,000) $ (5,000,000)  
Forward Contracts | Live Nation            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Maximum shares to be purchased     15,900,000      
Weighted average stock price shares purchased by counterparty   24.93        
Payments for (Proceeds from) Derivative Instrument, Investing Activities $ 396,000,000