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Financial instruments and fair value disclosures - Financial instruments measured at fair value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Orbital receivables, net $ 361 $ 382
Recurring    
Assets    
Long-term investments   1
Assets fair value   1
Liabilities    
Long-term debt 2,556 3,004
Liabilities fair value 2,576 3,022
Recurring | Interest rate swaps    
Liabilities    
Derivative financial instruments 20 18
Recurring | Level 1    
Assets    
Long-term investments   1
Assets fair value   1
Recurring | Level 2    
Liabilities    
Long-term debt 2,556 3,004
Liabilities fair value 2,576 3,022
Recurring | Level 2 | Interest rate swaps    
Liabilities    
Derivative financial instruments $ 20 $ 18