XML 491 R107.htm IDEA: XBRL DOCUMENT v3.21.1
Income taxes - Deferred tax balance sheet presentation (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred taxes presented on the balance sheet        
Deferred tax assets $ 7,016 $ 6,216 $ 6,663  
Deferred tax liabilities (10,326) (11,858) (11,490)  
NET DEFERRED TAX LIABILITY $ (3,310) $ (5,642) $ (4,827) $ (5,622)