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Additional disclosure items G.2.2. Lease commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]      
Rental expense $ 1 $ 152 $ 151
Minimum lease payments payable under non-cancellable operating lease   801  
Minimum finance lease payments payable   914  
Finance lease liabilities   353  
Interest expense on finance leases $ 157 91 $ 65
1 year      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments payable under non-cancellable operating lease   127  
Minimum finance lease payments payable   99  
1 to 5 years      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments payable under non-cancellable operating lease   412  
Minimum finance lease payments payable   400  
After five years      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments payable under non-cancellable operating lease   262  
Minimum finance lease payments payable   415  
Joint ventures      
Disclosure of finance lease and operating lease by lessee [Line Items]      
Minimum lease payments payable under non-cancellable operating lease   312  
Minimum finance lease payments payable   $ 1