Taxes on Earnings - Narrative (Details) - USD ($)
$ in Millions |
3 Months Ended |
6 Months Ended |
|
Apr. 30, 2018 |
Apr. 30, 2017 |
Apr. 30, 2018 |
Apr. 30, 2017 |
Oct. 31, 2017 |
| Income Tax Disclosure [Abstract] |
|
|
|
|
|
| Effective tax rate (as a percent) |
832.80%
|
523.00%
|
401.70%
|
150.70%
|
|
| Net income tax charges (benefits) |
$ (1,000)
|
$ (556)
|
$ (3,200)
|
$ 525
|
|
| Pre-Separation tax matters |
1,100
|
|
2,000
|
|
|
| Net excess tax benefits related to stock compensation |
28
|
|
42
|
|
|
| Income tax benefit on restructuring charges, separation costs, transformation costs and acquisition and other related charges |
18
|
36
|
62
|
67
|
|
| Income tax benefits from U.S. tax reform |
125
|
|
681
|
|
|
| Benefit from liquidation of business |
|
|
203
|
|
|
| Foreign tax credit |
|
|
239
|
|
|
| Accrued divestiture tax |
|
110
|
|
110
|
|
| Valuation allowance |
|
473
|
|
473
|
|
| Tax indemnification |
|
$ 13
|
|
$ 31
|
|
| Transition tax |
100
|
|
1,100
|
|
|
| Provisional tax benefit from Tax Cut and Jobs Act |
|
|
1,800
|
|
|
| Unrecognized tax benefits |
8,800
|
|
8,800
|
|
$ 11,300
|
| Unrecognized tax benefits that would affect effective tax rate if realized |
1,000
|
|
1,000
|
|
3,000
|
| Decrease from settlements with IRS |
|
|
2,500
|
|
|
| Accrued income tax for interest and penalties |
165
|
|
$ 165
|
|
$ 304
|
| Likelihood of no resolution period |
|
|
12 months
|
|
|
| Reasonably possible reduction in existing unrecognized tax benefits within the next 12 months |
$ 85
|
|
$ 85
|
|
|
| Likelihood of conclusion period for certain federal, foreign and state tax issues |
|
|
12 months
|
|
|