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Fair Value Measurements (Details 2) - USD ($)
 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 11,700,000,000 $ 9,300,000,000
Maturity period of primarily bank time deposits, classified as time deposits 90 days  
Time deposits $ 0 1,000,000,000.0
Restricted cash 1,100,000,000 1,100,000,000
Level 1 | Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debt 14,800,000,000  
Level 2 | Other Long-term Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of debt 900,000,000  
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, net carrying value 14,900,000,000 18,700,000,000
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, net carrying value $ 15,700,000,000 $ 18,700,000,000
Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Maturity period of primarily bank time deposits, maximum, classified as cash equivalents and money market funds (in days) 90 days