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Accounting and Reporting Developments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounting Policies [Abstract] |  |  |
Operating Lease Liability | $ 212 | $ 220 |
Operating lease right-of-use assets, net | 209 | 220 | $ 0
Finance Lease, Liability, Current | 2 | 5 |
Finance Lease, Liability, Noncurrent | $ 13 | $ 24 |

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