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Summary of Significant Accounting Policies - Recent Accounting Developments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease liabilities | $ 573 |
Operating lease right-of-use assets | $ 482 |
ASU 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease liabilities |  | $ 404
Operating lease right-of-use assets |  | $ 321

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + 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=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + 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 (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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