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Goodwill (Tables)
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
 (in millions)Commercial IndustriesGovernment ServicesTransportationTotal
Balance at December 31, 2020$837 $623 $68 $1,528 
Foreign currency translation(4)(3)(2)(9)
Balance at June 30, 2021$833 $620 $66 $1,519 
Gross goodwill$2,386 $1,374 $646 $4,406 
Accumulated impairment(1,553)(754)(580)(2,887)
Balance at June 30, 2021$833 $620 $66 $1,519