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Revenue Recognition - Remaining Performance Obligation (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 2,000
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 1,658
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 1,355
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 982
Performance obligations expected to be satisfied, expected timing 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligations expected to be satisfied $ 1,825
Performance obligations expected to be satisfied, expected timing