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Leases - Operating lease reconciliation (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Reconciliation of future undiscounted cash flows to the operating lease liabilities and the related ROU assets    
2021 (Excluding the nine months ended September 30, 2021) $ 14  
2022 51  
2023 41  
2024 30  
2025 21  
Thereafter 67  
Total future lease payments 224  
Less imputed interest 25  
Present value of future lease payments $ 199  
Operating Lease, Liability, Statement of Financial Position Accounts Payable and Accrued Liabilities, Current, Non-current operating lease liabilities  
Less current lease liabilities $ 47  
Operating Lease, Liability, Current, Statement of Financial Position Accounts Payable and Accrued Liabilities, Current  
Non-current operating lease liabilities $ 152 $ 136
Operating lease assets $ 191 $ 173