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Leases Lessee Disclosure - Lease Liability Maturity Table - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Lessee Disclosure - Lease Maturity Table [Abstract] |  |
Lessee, Liability, Payments, Remainder of Fiscal Year | $ 33 |
Lessee, Liability, Payments, Due Year Two | 174 |
Lessee, Liability, Payments, Due Year Three | 145 |
Lessee, Liability, Payments, Due Year Four | 115 |
Lessee, Liability, Payments, Due Year Five | 85 |
Lessee, Liability, Payments, Due after Year Five | 181 |
Lessee, Liability, Payments, Due | 733 |
Lease, Liability, Undiscounted Excess Amount | 101 |
Lease, Liability | 632 |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | 30 |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | $ 165
Lessee, Operating Lease, Liability, Payments, Due Year Two | 162 | 144
Lessee, Operating Lease, Liability, Payments, Due Year Three | 135 | 120
Lessee, Operating Lease, Liability, Payments, Due Year Four | 109 | 95
Lessee, Operating Lease, Liability, Payments, Due Year Five | 82 | 79
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 181 | 196
Lessee, Operating Lease, Liability, Payments, Due | 699 | $ 799
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 99 |
Operating Lease, Liability | 600 |
Finance Lease, Liability, Payment, Due [Abstract] |  |
Finance Lease, Liability, Payments, Remainder of Fiscal Year | 3 |
Finance Lease, Liability, Payments, Due Year Two | 12 |
Finance Lease, Liability, Payments, Due Year Three | 10 |
Finance Lease, Liability, Payments, Due Year Four | 6 |
Finance Lease, Liability, Payments, Due Year Five | 3 |
Finance Lease, Liability, Payments, Due after Year Five | 0 |
Finance Lease, Liability, Payment, Due | 34 |
Finance Lease, Liability, Undiscounted Excess Amount | 2 |
Finance Lease, Liability | $ 32 |

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