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Intangible Assets and Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Intangible assets            
Weighted Amortizable Life (in years)   14 years   14 years    
Finite-Lived Intangible Assets, Gross $ 4,069     $ 4,069   $ 4,096
Finite-Lived Intangible Assets, Accumulated Amortization (2,893)     (2,893)   (2,788)
Net 1,176     1,176   1,308
Amortization expense 76   $ 78 153 $ 158  
Remaining Six Months of 2021 149     149    
2022 284     284    
2023 226     226    
2024 167     167    
2025 157     157    
Thereafter 193     $ 193    
Customer Relationships            
Intangible assets            
Weighted Amortizable Life (in years)   15 years   15 years    
Finite-Lived Intangible Assets, Gross 2,457     $ 2,457   2,493
Finite-Lived Intangible Assets, Accumulated Amortization (1,655)     (1,655)   (1,600)
Net 802     $ 802   893
Intellectual Property            
Intangible assets            
Weighted Amortizable Life (in years)   12 years   12 years    
Finite-Lived Intangible Assets, Gross 1,447     $ 1,447   1,439
Finite-Lived Intangible Assets, Accumulated Amortization (1,129)     (1,129)   (1,073)
Net 318     $ 318   366
Other            
Intangible assets            
Weighted Amortizable Life (in years)   14 years   14 years    
Finite-Lived Intangible Assets, Gross 165     $ 165   164
Finite-Lived Intangible Assets, Accumulated Amortization (109)     (109)   (115)
Net $ 56     $ 56   $ 49