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Contingencies And Commitments (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Loss Contingencies [Line Items] |  |
Operating lease ROU asset | $ 189 | $ 189
Operating lease liability | $ 198 | $ 198
Weighted average discount rate, operating lease | 3.30% | 3.30%
Weighted average remaining operating lease term | 6 years | 6 years
Operating lease expense | $ 13 | $ 27
Sale-leaseback, net book value | 159 | 159
Sale-leaseback, accumulated amortization | $ 318 | $ 318
Weighted average discount rate, finance lease | 2.70% | 2.70%
Weighted average remaining finance lease term | 3 years | 3 years
Additional office lease |  | $ 40
Pending Litigation [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, estimate | $ 50 | $ 50
Maximum [Member] |  |
Loss Contingencies [Line Items] |  |
Lease term | 11 years | 11 years
Minimum [Member] |  |
Loss Contingencies [Line Items] |  |
Lease term | 7 years | 7 years

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