Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Statement of Comprehensive Income [Abstract] | ||||
| Net income | $ 168 | $ 171 | $ 313 | $ 306 |
| Unrealized foreign currency translation adjustments | 12 | 8 | (9) | 0 |
| Pension and other retirement benefits adjustments (net of taxes for the three and six months ended March 31, 2017 of $9 and $18, respectively; net of taxes for the three and six months ended March 31, 2016 of $8 and $16, respectively) | 16 | 13 | 32 | 26 |
| Foreign currency cash flow hedge adjustments (net of taxes for the three and six months ended March 31, 2017 of $1 and $1, respectively; net of taxes for the three and six months ended March 31, 2016 of $1 and $1, respectively) | 5 | 2 | 2 | 3 |
| Comprehensive income | $ 201 | $ 194 | $ 338 | $ 335 |