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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill balances and adjustments by reportable segment
The following table presents goodwill activity for the period indicated (in millions):
 December 31,
2020		Goodwill
Acquired		 Adjustments September 30,
2021
Goodwill$4,285 $— $(147)$4,138