Annual report pursuant to Section 13 and 15(d)

Leases - Components of lease expense (Details)

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Leases - Components of lease expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance lease cost      
Depreciation of leased assets $ 37    
Interest on lease liabilities 6    
Total finance lease cost 43    
Operating lease cost 89    
Sublease income (3)    
Total lease cost $ 129    
Rent expense   $ 64 $ 58