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Leases - (Tables) | 9 Months Ended
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Sep. 30, 2019
Leases [Abstract] |
Operating Lease Payments | Future minimum lease payments as of September 30, 2019 and December 31, 2018 were as follows:
(in millions) | September 30, 2019 (2) | December 31, 2018 (3)
2019(1) | $ | 5 |  | $ | 18 |
2020 | 19 |  | 17 |
2021 | 11 |  | 11 |
2022 | 10 |  | 9 |
2023 | 9 |  | 8 |
2024 | 6 |  | 5 |
2025 and thereafter | 19 |  | 20 |
Total future minimum lease payments | $ | 79 |  | $ | 88 |
Less: imputed interest | (10 | ) | N/A(4) |
Total operating lease liabilities | 69 |  | N/A(4) |
Current portion | 17 |  | N/A(4) |
Non-current portion | 52 |  | N/A(4) |
(1) The remaining payments as of September 30, 2019 exclude those made during the nine months ended September 30, 2019.
(2) | Presented in accordance with ASC 842.
(3) Presented in accordance with ASC 840. (4) N/A - Not Applicable under ASC 840.

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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