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Contingencies and Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Purchase Obligations and Minimum Lease Payments
Future Obligations
 
2018
2019
2020
2021
2022
Thereafter
Debt repayments
$
600

$
1,250

$
500

$
750

$
—

$
4,150

Purchase obligations
$
1,046

$
95

$
2

$
1

$
—

$
—

Minimum lease payments
$
106

$
63

$
45

$
31

$
21

$
60