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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following is the summary of the change in the carrying amount of goodwill:
20212020
(millions)
Balance at January 1$473 $471 
   Goodwill attributable to 2019 acquisition of Blue Union and LEAP— 2 
Balance at December 31$473 $473