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Leases Summary of Operating Lease Liabilities Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Operating Leases, Summary of Aggregate Future Lease Payments After Adoption of 842 |  |
2019 (remaining nine months) | $ 69 |
2020 | 84 |
2021 | 72 |
2022 | 65 |
2023 | 57 |
Thereafter | 257 |
Total undiscounted lease payments | 604 |
Less: imputed interest | (100) |
Total discounted lease payments | $ 504 |
Operating Leases, Summary of Aggregate Future Lease Payments Before Adoption of 842 |  |
2019 |  | $ 89
2020 |  | 78
2021 |  | 66
2022 |  | 60
2023 |  | 52
Thereafter |  | 229
Total minimum lease payments |  | $ 574

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