v3.19.3.a.u2
Additional Financial Information (Consolidated Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Additional Financial Information [Abstract]      
Interest $ 8,693 $ 8,818 $ 6,622
Income taxes, net of refunds $ 1,421 $ (354) $ 2,006