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Leases - NPC - Schedule of Lease Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Operating    
2024 $ 148  
2025 122  
2026 97  
2027 71  
2028 45  
Thereafter 170  
Total undiscounted lease payments 653  
Less - amounts representing interest (98)  
Operating leases 555 $ 605
Finance    
2024 63  
2025 62  
2026 62  
2027 58  
2028 52  
Thereafter 512  
Total undiscounted lease payments 809  
Less - amounts representing interest (396)  
Finance leases 413 432
Total    
2024 211  
2025 184  
2026 159  
2027 129  
2028 97  
Thereafter 682  
Total undiscounted lease payments 1,462  
Less - amounts representing interest (494)  
Total lease liabilities 968 1,037
NPC    
Operating    
2024 3  
2025 3  
2026 3  
2027 2  
2028 0  
Thereafter 0  
Total undiscounted lease payments 11  
Less - amounts representing interest (2)  
Operating leases 9 11
Finance    
2024 45  
2025 44  
2026 44  
2027 42  
2028 39  
Thereafter 377  
Total undiscounted lease payments 591  
Less - amounts representing interest (293)  
Finance leases 298 313
Total    
2024 48  
2025 47  
2026 47  
2027 44  
2028 39  
Thereafter 377  
Total undiscounted lease payments 602  
Less - amounts representing interest (295)  
Total lease liabilities $ 307 $ 324