Condensed Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
Mar. 31, 2016 |
Mar. 31, 2015 |
|
| Statement of Comprehensive Income [Abstract] | ||||
| Pension and other retirement benefits adjustments tax benefit | $ 8 | $ 6 | $ 16 | $ 13 |
| Foreign currency cash flow hedge adjustment tax benefit (expense) | $ 1 | $ 1 | $ 1 | $ (1) |