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Intangible Assets Including Goodwill - Intangible Assets Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Intangible assets        
Intangible assets, increase (decrease)     $ (1,273)  
Intangible asset amortization expense $ 613 $ 614 1,858 $ 1,224
Retirement of fully amortized intangible assets     $ 1,258