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Special Charges (Credits) - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Other Income and Expenses [Abstract] |  |
CARES Act grant | $ (1,810) | $ 0
Severance and benefit costs | 417 | 0
Impairment of assets | 0 | 50
(Gains) losses on sale of assets and other special charges | 16 | 13
Total operating special charges (credits) | (1,377) | 63
Nonoperating special termination benefits | 46 | 0
Nonoperating unrealized losses on investments, net | 22 | 319
Nonoperating credit loss on BRW Term Loan and related guarantee | 0 | 697
Total nonoperating special charges and unrealized losses on investments, net | 68 | 1,016
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net | (1,309) | 1,079
Income tax expense (benefit), net of valuation allowance | 291 | (14)
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net of income taxes | $ (1,018) | $ 1,065

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