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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Portion at Other than Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Customer financing notes receivable	$ 195	$ 195
Long-term debt (excluding finance leases)	(31,233)	(31,250)
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities held in trusts	857	965
Derivative assets	117	70
Derivative liabilities	(226)	(213)
Customer financing notes receivable	187	192
Long-term debt (excluding finance leases)	(32,566)	(35,828)
Marketable securities held in trusts	857	965
Fair Value Level 1 [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities held in trusts	783	890
Derivative assets	0	0
Derivative liabilities	0	0
Customer financing notes receivable	0	0
Long-term debt (excluding finance leases)	0	0
Fair Value Level 2 [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities held in trusts	74	75
Derivative assets	117	70
Derivative liabilities	(226)	(213)
Customer financing notes receivable	187	192
Long-term debt (excluding finance leases)	(32,516)	(35,778)
Fair Value Level 3 [Member] | Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities held in trusts	0	0
Derivative assets	0	0
Derivative liabilities	0	0
Customer financing notes receivable	0	0
Long-term debt (excluding finance leases)	$ (50)	$ (50)

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Amount of investment in marketable security, classified as current.

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