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Software (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Computer Software      
Impairment of computer software $ 87    
Amortization expense for intangible assets with finite lives 1,444 $ 659 $ 670
Software      
Computer Software      
Amortization expense for intangible assets with finite lives $ 616 $ 468 $ 436