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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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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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