Fair Value Measurements (Fair Value Hierarchy Classification) (Details) - USD ($)
$ in Millions |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Short-term borrowings |
$ 1,077
|
$ 601
|
| Portion at Other than Fair Value Measurement [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Long-term receivables |
147
|
127
|
| Customer financing notes receivable |
430
|
437
|
| Short-term borrowings |
1,077
|
601
|
| Long-term debt (excluding capitalized leases) |
26,161
|
23,280
|
| Long-term liabilities |
363
|
457
|
| Estimate of Fair Value, Fair Value Disclosure [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Long-term receivables |
139
|
121
|
| Customer financing notes receivable |
414
|
420
|
| Short-term borrowings |
1,077
|
601
|
| Long-term debt (excluding capitalized leases) |
28,052
|
25,110
|
| Long-term liabilities |
331
|
427
|
| 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
|
|
| Customer financing notes receivable |
0
|
|
| Short-term borrowings |
0
|
|
| Long-term debt (excluding capitalized leases) |
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 |
139
|
|
| Customer financing notes receivable |
414
|
|
| Short-term borrowings |
943
|
|
| Long-term debt (excluding capitalized leases) |
27,827
|
|
| Long-term liabilities |
331
|
|
| 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
|
|
| Customer financing notes receivable |
0
|
|
| Short-term borrowings |
134
|
|
| Long-term debt (excluding capitalized leases) |
225
|
|
| Long-term liabilities |
0
|
|
| Fair Value, Measurements, Recurring [Member] |
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Available-for-sale securities |
120
|
987
|
| Derivative Assets |
390
|
170
|
| Derivative Liabilities |
90
|
354
|
| 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 |
120
|
987
|
| 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 |
390
|
170
|
| Derivative Liabilities |
90
|
354
|
| 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
|