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Revenue Recognition - Performance Obligations Expected Timing of Satisfaction (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Estimated future fixed fee performance obligations $ 414
Revenue remaining performance obligation period 3 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]  
Estimated future fixed fee performance obligations $ 1,400
Revenue remaining performance obligation period 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]  
Estimated future fixed fee performance obligations $ 1,000
Revenue remaining performance obligation period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Estimated future fixed fee performance obligations $ 722
Revenue remaining performance obligation period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Estimated future fixed fee performance obligations $ 434
Revenue remaining performance obligation period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Estimated future fixed fee performance obligations $ 103
Revenue remaining performance obligation period 1 year