Annual report [Section 13 and 15(d), not S-K Item 405]

Summary of Significant Accounting Policies - Remaining Performance Obligations (Details)

v3.25.0.1
Summary of Significant Accounting Policies - Remaining Performance Obligations (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Minimum  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Rural health care program, term of contract 3 years
Maximum  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Rural health care program, term of contract 5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation $ 369
Remaining performance obligation expected timing of satisfaction 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]  
Revenue, remaining performance obligation $ 223
Remaining performance obligation expected timing of satisfaction 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]  
Revenue, remaining performance obligation $ 113
Remaining performance obligation expected timing of satisfaction 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]  
Revenue, remaining performance obligation $ 27
Remaining performance obligation expected timing of satisfaction period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2029-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation $ 21
Remaining performance obligation expected timing of satisfaction period 1 year