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Revenue Contract Balances (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, after Allowance for Credit Loss | $ 163,000,000 |  | $ 109,000,000
Financing Receivable, Allowance for Credit Loss | 12,000,000 |  |
Contract with Customer, Liability | 137,000,000 |  | $ 117,000,000
Contract with Customer, Liability, Revenue Recognized | 11,000,000 | $ 7,000,000 |
Mong Duong Subsidiary [Member] |  |  |
Financing Receivable, after Allowance for Credit Loss | 1,400,000,000 |  |
Financing Receivable, Allowance for Credit Loss | $ 33,000,000 |  |

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