Contingencies and Commitments (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of minimum rental payments for operating leases | Future minimum rental payments for operating leases having non-cancellable terms in excess of one year are as follows (in millions).
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