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Accumulated Other Comprehensive Income (Details 1) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | $ (369) | $ (248) | $ (619) | $ (493)
Income taxes | (115) | (132) | (367) | (284)
Prior-service costs | (705) | (675) | (1,667) | (1,332)
NET INCOME | 299 | 174 | 1,668 | 379
Reclassifications from AOCI | Gains & losses on cash flow hedges |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes | 0 | (1) | (1) | (2)
Net of tax | 2 | 0 | 3 | 2
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense | 2 | 1 | 4 | 4
Reclassifications from AOCI | Unrealized gains on AFS securities |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net of tax | 0 | (4) | (1) | (14)
Reclassifications from AOCI | Net prior service costs |  |  |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income taxes | 4 | 8 | 9 | 14
Prior-service costs | (19) | (18) | (37) | (36)
NET INCOME | $ (15) | $ (10) | $ (28) | $ (22)

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