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Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term borrowings $ 985 $ 392
Portion at Other than Fair Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 132 127
Customer financing notes receivable 577 609
Short-term borrowings 985 392
Long-term debt (excluding capitalized leases) 27,301 27,067
Long-term liabilities 307 362
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 122 121
Customer financing notes receivable 554 596
Short-term borrowings 985 392
Long-term debt (excluding capitalized leases) 27,755 29,180
Long-term liabilities 271 330
Fair Value Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 0 0
Customer financing notes receivable 0 0
Short-term borrowings 0 0
Long-term debt (excluding capitalized leases) 0 0
Long-term liabilities 0  
Fair Value Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 122 121
Customer financing notes receivable 554 596
Short-term borrowings 876 300
Long-term debt (excluding capitalized leases) 27,496 28,970
Long-term liabilities 271 330
Fair Value Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term receivables 0 0
Customer financing notes receivable 0 0
Short-term borrowings 109 92
Long-term debt (excluding capitalized leases) 259 210
Long-term liabilities 0 0
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 42 64
Derivative Assets 111 253
Fair Value, Measurements, Recurring [Member] | Fair Value Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 42 64
Derivative Assets 0 0
Derivative Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Derivative Assets 111 253
Derivative Liabilities 214 78
Fair Value, Measurements, Recurring [Member] | Fair Value Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale securities 0 0
Derivative Assets 0 0
Derivative Liabilities $ 0 $ 0