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Commitments and Contingencies - Operating Leases (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2019 USD ($)
Long-term Purchase Commitment [Line Items] |  |
Rent expense | $ 84 | $ 266
Operating lease right of use asset obtained in exchange for lease liability |  | 470
Operating lease payments for the remainder of 2019 | 67 | 67
2020 | 270 | 270
2021 | 246 | 246
2022 | 178 | 178
2023 | 166 | 166
Thereafter | 582 | 582
Imputed interest | $ 217 | $ 217
Weighted average discount rate | 4.20% | 4.20%
Operating lease weighted-average remaining lease term | 7 years 3 months 18 days | 7 years 3 months 18 days
Operating lease payments |  | $ 271
Other assets [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Operating lease right-of-use assets | $ 1,200 | 1,200
Accrued Liabilities [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Current operating lease liability | 243 | 243
Other liabilities [Member] |  |
Long-term Purchase Commitment [Line Items] |  |
Noncurrent operating lease liability | $ 1,000 | $ 1,000

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