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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
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	$ 312	$ 271
Short-term borrowings	(196)	(247)
Long-term debt (excluding finance leases)	(31,185)	(31,512)
Long-term liabilities	(32)	(27)
Marketable securities held in trusts		881
Short-term borrowings	(196)	(247)
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities held in trusts	908	881
Derivative assets	247	241
Derivative liabilities	(95)	(98)
Customer financing notes receivable	302	264
Short-term borrowings	(196)	(247)
Long-term debt (excluding finance leases)	(36,794)	(38,615)
Long-term liabilities	(30)	(25)
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	837	773
Derivative assets	0	0
Derivative liabilities	0	0
Customer financing notes receivable	0	0
Short-term borrowings	0	0
Long-term debt (excluding finance leases)	0	0
Long-term liabilities	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	71	108
Derivative assets	247	241
Derivative liabilities	(95)	(98)
Customer financing notes receivable	302	264
Short-term borrowings	(160)	(160)
Long-term debt (excluding finance leases)	(36,740)	(38,540)
Long-term liabilities	(30)	(25)
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
Short-term borrowings	(36)	(87)
Long-term debt (excluding finance leases)	(54)	(75)
Long-term liabilities	$ 0	$ 0

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