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Revenue Recognition - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Revenue recognized which was included in the contract liability balance $ 492 $ 380  
Increase in contract assets due to business acquisition   153  
Increase in contract liabilities due to business acquisition   117  
Capitalized contract costs, amortization 124 105 $ 106
Capitalized contract cost, impairment loss $ 0 $ 0 $ 0