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Summary of Significant Accounting Policies - Cumulative Effect of Adoption of ASUs on the Consolidated Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Operating lease right-of-use assets | $ 427 | $ 466 | $ 347 | $ 0
Liabilities: |  |  |  |
Accounts payable and accrued expenses | 1,223 | 1,151 | 735 | 736
Operating lease current liabilities | 48 | 46 | 30 | 0
Operating lease liabilities | 419 | 456 | 339 | 0
Other long-term liabilities | $ 149 | $ 94 | 81 | $ 102
Accounting Standards Update 2016-02 |  |  |  |
ASSETS |  |  |  |
Operating lease right-of-use assets |  |  | 347 |
Liabilities: |  |  |  |
Accounts payable and accrued expenses |  |  | (1) |
Operating lease current liabilities |  |  | 30 |
Operating lease liabilities |  |  | 339 |
Other long-term liabilities |  |  | $ (21) |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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