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Additional disclosure items G.2.2. Lease commitments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum operating lease payments recognised as expense $ 155 $ 155 $ 159
Minimum lease payments payable under non-cancellable operating lease 800 759  
Minimum finance lease payments payable 914 978  
Finance lease liabilities 353 365  
Interest expense on finance leases 92 65 48
1 year      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments payable under non-cancellable operating lease 127 130  
Minimum finance lease payments payable 99 97  
1 to 5 years      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments payable under non-cancellable operating lease 412 372  
Minimum finance lease payments payable 400 404  
Greater than 5 years      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments payable under non-cancellable operating lease 262 258  
Minimum finance lease payments payable 415 477  
Joint ventures      
Disclosure of finance lease and operating lease by lessee [line items]      
Minimum lease payments payable under non-cancellable operating lease 312 194 $ 210
Minimum finance lease payments payable $ 1 $ 5