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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Minimum Rental Commitments As of December 31, 2018, minimum rental commitments under non-cancelable operating leases in effect at year-end were (in millions):
 
2019
 
2020
 
2021
 
2022
 
2023
 
Thereafter
 
Total
$
208

 
$
165

 
$
114

 
$
79

 
$
57

 
$
157

 
$
780