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Intangible Assets and Goodwill - Amortized Intangible Assets, Excluding Goodwill, by Business Segment (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 2,181 $ 2,037
Accumulated Amortization 947 710
Products and Systems Integration    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 692 652
Accumulated Amortization 129 82
Software and Services    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,489 1,385
Accumulated Amortization $ 818 $ 628