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Special Charges (Credits) - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other Income and Expenses [Abstract] |  |  |  |
CARES Act grant | $ (1,079) | $ (1,589) | $ (2,889) | $ (1,589)
Impairment of assets | 59 | 80 | 59 | 130
Severance and benefit costs | 11 | 63 | 428 | 63
(Gains) losses on sale of assets and other special charges | 61 | (3) | 77 | 10
Total operating special charges (credits) | (948) | (1,449) | (2,325) | (1,386)
Nonoperating unrealized (gains) losses on investments, net | (147) | (9) | (125) | 310
Nonoperating debt extinguishment and modification fees | 62 | 0 | 62 | 0
Settlement loss — Voluntary Programs (defined below) | 0 | 231 | 46 | 231
Nonoperating credit loss on BRW Term Loan and related guarantee | 0 | 0 | 0 | 697
Total nonoperating special charges and unrealized (gains) losses on investments, net | (85) | 222 | (17) | 1,238
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net | (1,033) | (1,227) | (2,342) | (148)
Income tax expense (benefit), net of valuation allowance | 203 | 241 | 494 | 227
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes | $ (830) | $ (986) | $ (1,848) | $ 79

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