Annual report pursuant to Section 13 and 15(d)

Leases - Supplemental balance sheet information related to leases (Details)

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Leases - Supplemental balance sheet information related to leases (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Leases      
Operating lease right-of-use assets $ 510    
Operating lease right-of-use assets location us-gaap:OtherAssetsNoncurrent    
Current operating lease liabilities $ 53    
Current operating lease liabilities location us-gaap:OtherLiabilitiesCurrent    
Operating lease liabilities $ 495    
Operating lease liabilities location us-gaap:OtherLiabilitiesNoncurrent    
Total operating lease liabilities $ 548    
Property and equipment, at cost 3,780 $ 3,394 $ 3,765
Accumulated depreciation (1,518) $ (1,281) (1,296)
Property and equipment, net 2,262   $ 2,469
Current finance lease liabilities $ 4    
Current finance lease liabilities location us-gaap:OtherLiabilitiesCurrent    
Finance lease noncurrent liabilities $ 119    
Finance lease liabilities location us-gaap:OtherLiabilitiesNoncurrent    
Total finance lease liabilities $ 123    
Finance Leases      
Leases      
Property and equipment, at cost 473    
Accumulated depreciation (89)    
Property and equipment, net $ 384