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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle\ |  |
Operating lease ROU assets | $ 419 |
Operating lease liability | $ 426 |
ASU 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle\ |  |
Operating lease ROU assets |  | $ 442
Operating lease liability |  | $ 446
Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle\ |  |
Lease renewal options | 1 year |
Maximum |  |
New Accounting Pronouncements or Change in Accounting Principle\ |  |
Lease renewal options | 5 years |

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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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