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Contingencies and Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future Purchase Obligations and Minimum Lease Payments
Future Obligations
 
2019
2020
2021
2022
2023
Thereafter
Debt repayments
$
1,373

$
844

$
750

$
—

$
630

$
6,355

Purchase obligations
$
1,306

$
74

$
6

$
6

$
7

$
12

Minimum lease payments
$
107

$
53

$
39

$
30

$
24

$
89