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Revenue Recognition Revenue Allocated to Remaining Performance Obligations (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue allocated to remaining performance obligations for contracted revenue $ 32,237
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition 1 year
Revenue allocated to remaining performance obligations for contracted revenue $ 4,881
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition 2 years
Revenue allocated to remaining performance obligations for contracted revenue $ 4,182
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition 3 years
Revenue allocated to remaining performance obligations for contracted revenue $ 3,528
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition 4 years
Revenue allocated to remaining performance obligations for contracted revenue $ 3,011
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition 5 years
Revenue allocated to remaining performance obligations for contracted revenue $ 2,497
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Year [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, period of recognition
Revenue allocated to remaining performance obligations for contracted revenue $ 14,138