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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) |

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