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Leases (Tables)
 12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Future Minimum Lease Commitments
Future minimum lease commitments at December 31, 2019 were as follows (in millions):
 
Total
2020
2021
2022
2023
2024
Thereafter
Operating leases
$
1,287

 
$
280

 
$
190

 
$
154

 
$
119

 
$
98

 
$
446

 
Less: imputed interest
$
182

 
 
 
 
 
 
 
 
 
 
 
 
 
Total
$
1,105