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Special Charges and Unrealized (Gains) Losses on Investments (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Components of Special Charges
Special charges and unrealized gains and losses on investments in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):
Operating:202020192018
CARES Act grant$(3,536)$— $— 
Severance and benefit costs575 1641 
Impairment of assets318 171 377 
Termination of an engine maintenance service agreement— — 64 
(Gains) losses on sale of assets and other special charges27 59 
Total operating special charges (credit)(2,616)246 487 
Nonoperating credit loss on BRW Term Loan and related guarantee697 — — 
Nonoperating special termination benefits and settlement losses687 — — 
Nonoperating unrealized (gains) losses on investments194 (153)
Total nonoperating special charges and unrealized (gains) losses on investments1,578 (153)
Total operating and nonoperating special charges (credit) and unrealized (gains) losses on investments(1,038)93 492 
Income tax expense (benefit), net of valuation allowance404 (21)(110)
Income tax adjustments (Note 6)— — (5)
Total operating and nonoperating special charges (credit) and unrealized (gains) losses on investments, net of income taxes$(634)$72 $377