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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Future Minimum Lease Commitments
Future minimum lease commitments at December 31, 2020 were as follows (in millions):
Total20212022202320242025Thereafter
Operating leases$1,273 $300 $199 $156 $126 $89 $403 
Less: imputed interest$158 
Total$1,115