Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Effect of ASU 2016-02 (Details)

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Summary of Significant Accounting Policies - Effect of ASU 2016-02 (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Prepaid expenses and other current assets $ 221   $ 158
Operating lease right-of-use assets 428 $ 347 0
Accounts payable and accrued expenses 1,072 735 736
Operating lease current liabilities 46 30 0
Operating lease liabilities 397 339 0
Other long-term liabilities $ 91 81 $ 102
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right-of-use assets   347  
Accounts payable and accrued expenses   (1)  
Operating lease current liabilities   30  
Operating lease liabilities   339  
Other long-term liabilities   $ (21)