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Leases Future Minimum Lease Payments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
Capital Leases, Future Minimum Payments Due, Next Twelve Months |  | $ 6
Contractual Obligation, Due in Next Fiscal Year |  | 11
Operating Leases, Future Minimum Payments Due, Next Twelve Months | $ 8 | 4
Capital Leases, Future Minimum Payments Due in Two Years |  | 6
Contractual Obligation, Due in Second Year |  | 14
Operating Leases, Future Minimum Payments, Due in Two Years |  | 5
Capital Leases, Future Minimum Payments Due in Three Years |  | 6
Contractual Obligation, Due in Third Year |  | 13
Operating Leases, Future Minimum Payments, Due in Three Years |  | 5
Capital Leases, Future Minimum Payments Due in Four Years |  | 6
Contractual Obligation, Due in Fourth Year |  | 13
Operating Leases, Future Minimum Payments, Due in Four Years |  | 6
Capital Leases, Future Minimum Payments Due in Five Years |  | 5
Contractual Obligation, Due in Fifth Year |  | 13
Operating Leases, Future Minimum Payments, Due in Five Years |  | 7
Capital Leases, Future Minimum Payments Due Thereafter |  | 67
Contractual Obligation, Due after Fifth Year |  | 225
Operating Leases, Future Minimum Payments, Due Thereafter |  | 97
Capital Leases, Future Minimum Payments Due |  | 96
Contractual Obligation |  | 289
Operating Leases, Future Minimum Payments Due |  | 124
Capital Leases, Future Minimum Payments, Interest Included in Payments |  | (47)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments |  | 49
Capital Lease Obligations, Current | (2) | (2)
Purchase Commitment, Remaining Minimum Amount Committed | $ 47 | $ 47

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