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Accumulated Other Comprehensive Income - Amounts Reclassified (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ (266)			$ (261)			$ (792)	$ (773)
Other operating expenses	(937)			(758)			(2,416)	(2,143)
Income taxes	(116)			(107)			(122)	(281)
NET INCOME	454	$ 309	$ 74	391	$ 312	$ 320	837	1,023
Reclassifications from AOCI | Gains & Losses on Cash Flow Hedges
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
NET INCOME	0			0			1	1
Reclassifications from AOCI | Gains & Losses on Cash Flow Hedges | Long-term debt
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0			0			1	1
Reclassifications from AOCI | Net prior service costs
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Other operating expenses	(3)			(7)			(30)	(21)
Income taxes	1			3			7	6
NET INCOME	$ (2)			$ (4)			$ (23)	$ (15)

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