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Self-Insurance Reserves (Notes)
 12 Months Ended
Dec. 31, 2022
Self-Insurance Reserves [Abstract]  
Self-Insurance Reserves [Text Block]
(6)    Self-Insurance Reserves
Following is a reconciliation of the self-insurance reserves for 2022, 2021 and 2020:
Balance at
Beginning of
Year
Additions
Charged to
Income
Deductions
From
Reserves
Balance at
End of
Year
(Amounts are in millions)
2022
Self-insurance reserves:
Current$191 526 507 210 
Noncurrent249 19 — 268 
$440 545 507 478 
2021
Self-insurance reserves:
Current$161 524 494 191 
Noncurrent236 13 — 249 
$397 537 494 440 
2020
Self-insurance reserves:
Current$149 396 384 161 
Noncurrent227 9 — 236 
$376 405 384 397