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Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Intangible assets          
Weighted Amortizable Life (in years)     14 years   14 years
Finite-Lived Intangible Assets, Gross $ 4,066   $ 4,066   $ 4,096
Finite-Lived Intangible Assets, Accumulated Amortization (2,945)   (2,945)   (2,788)
Net 1,121   1,121   $ 1,308
Amortization expense 75 $ 78 228 $ 236  
Remaining Three Months of 2021 74   74    
2022 287   287    
2023 228   228    
2024 170   170    
2025 160   160    
Thereafter 202   $ 202    
Customer Relationships          
Intangible assets          
Weighted Amortizable Life (in years)     15 years   15 years
Finite-Lived Intangible Assets, Gross 2,436   $ 2,436   $ 2,493
Finite-Lived Intangible Assets, Accumulated Amortization (1,682)   (1,682)   (1,600)
Net 754   $ 754   $ 893
Intellectual Property          
Intangible assets          
Weighted Amortizable Life (in years)     12 years   12 years
Finite-Lived Intangible Assets, Gross 1,473   $ 1,473   $ 1,439
Finite-Lived Intangible Assets, Accumulated Amortization (1,160)   (1,160)   (1,073)
Net 313   $ 313   $ 366
Other          
Intangible assets          
Weighted Amortizable Life (in years)     15 years   14 years
Finite-Lived Intangible Assets, Gross 157   $ 157   $ 164
Finite-Lived Intangible Assets, Accumulated Amortization (103)   (103)   (115)
Net $ 54   $ 54   $ 49