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Revenue, Remaining performance obligations (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 39,943
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-31  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 3,201
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 5,877
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 5,235
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 25,630
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 3 years 6 months