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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | $ (255) | $ (262) | $ (858) | $ (751)
Income taxes | (133) | (202) | (503) | (483)
Prior-service costs | (739) | (652) | (2,363) | (1,958)
NET INCOME (LOSS) | (458) | 396 | 1,210 | 775
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes | 0 | (1) | (1) | (3)
Net of tax | 2 | 3 | 5 | 5
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 2 | 4 | 6 | 8
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax | 0 | (21) | (1) | (35)
Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes | 5 | 7 | 14 | 21
Prior-service costs | (18) | (19) | (55) | (55)
NET INCOME (LOSS) | $ (13) | $ (12) | $ (41) | $ (34)

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