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Revenue, Remaining performance obligations (Details)
$ in Millions
Mar. 31, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Amount $ 40,323
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 $ 4,673
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 9 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 $ 5,621
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years
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 $ 5,094
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 3 years
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 $ 24,935
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 4 years