Business Combinations (Amortization) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 2,409
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,924
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2,040
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,106
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 2,020