text: The following is a summary of our debt and finance leases as of December 31, 2023 (in millions): 
  
  Unpaid 
  Principal 
  Balance  Unused 
  Committed 
  Amount (1) 
  
  Net Carrying Value 
  
  Contractual 
  Interest Rates  Contractual 
  Maturity Date  Current  Long-Term 
  
  $  37  $  — $  37  $  —  2.00 %  May 2024 
  —  —  —  5,000  Not applicable  January 2028 
  —  7  7  28  4.70-5.75%  March 2025-January 2031 
  37  7  44  5,028 
  
  1,906  2,337  4,259  —  0.60-6.57%  July 2024-May 2031 
  28  330  367  —  5.25-5.81%  July 2033-January 2035 
  4  8  13  —  4.80 %  December 2026 
  1,938  2,675  4,639  — 
  
  $  4,683  $  5,028 
  1,975  2,682 
  
  398  175 
  
  $  2,373  $  2,857 