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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Weighted average remaining lease term | 6 years 2 months 12 days | 6 years 2 months 12 days
Weighted average discount rate | 3.00% | 3.00%
Operating lease costs | $ 50 | $ 124
Operating lease payments | $ 76 | $ 147
Minimum | Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease, term of contract | 1 year | 1 year
Maximum | Accounting Standards Update 2016-02 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Operating lease, term of contract | 37 years | 37 years

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