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Leases - Operating lease reconciliation (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets |  |
2020 | $ 49 |
2021 | 39 |
2022 | 30 |
2023 | 23 |
2024 | 15 |
Thereafter | 33 |
Total future lease payments | 189 |
Less imputed interest | 28 |
Present value of future lease payments | 161 |
Less current lease liabilities | 41 |
Non-current operating lease liabilities | 120 |
Operating lease assets | $ 151 |
Operating lease assets and liabilities |  |
Operating Lease, Liability, Statement of Financial Position | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent | us-gaap:AccruedLiabilitiesCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Operating Lease, Liability, Current, Statement of Financial Position | us-gaap:AccruedLiabilitiesCurrent |
ASU 2016-02, Leases | Adjustment |  |
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets |  |
Present value of future lease payments |  | $ 170
Operating lease assets |  | $ 161

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