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Special Charges (Tables)
9 Months Ended
Sep. 30, 2024
Restructuring and Related Activities [Abstract]  
Schedule of Components of Special Charges
For the three and nine months ended September 30, operating and nonoperating special charges and unrealized (gains) losses on investments in the statements of consolidated operations consisted of the following (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Operating:
(Gains) losses on sale of assets and other special charges$(5)$28 $44 $88 
Labor contract ratification bonuses— — 814 
Total operating special charges(5)29 44 902 
Nonoperating:
Nonoperating unrealized (gains) losses on investments, net90 54 160 (54)
Nonoperating debt extinguishment and modification fees75 — 110 11 
Total nonoperating special charges and unrealized (gains) losses on investments, net165 54 270 (43)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net160 83 314 859 
Income tax benefit, net of valuation allowance (15)(7)(34)(204)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes$145 $76 $280 $655