Stock-Based Compensation and Earnings Per Share (Earnings Per Share and Diluted Share Equivalents) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended |
6 Months Ended |
Mar. 31, 2017 |
Mar. 31, 2016 |
Mar. 31, 2017 |
Mar. 31, 2016 |
| Computation of Basic and Diluted Earnings Per Share |
|
|
|
|
| Income from continuing operations |
$ 168
|
$ 172
|
$ 313
|
$ 305
|
| Income (loss) from discontinued operations, net of taxes |
0
|
(1)
|
0
|
1
|
| Net income |
$ 168
|
$ 171
|
$ 313
|
$ 306
|
| Denominator: |
|
|
|
|
| Denominator for basic earnings per share – weighted average common shares |
130.9
|
130.8
|
130.7
|
131.1
|
| Stock options |
1.0
|
1.0
|
0.9
|
1.1
|
| Performance shares, restricted stock and restricted stock units |
0.5
|
0.5
|
0.5
|
0.5
|
| Dilutive potential common shares |
1.5
|
1.5
|
1.4
|
1.6
|
| Denominator for diluted earnings per share – adjusted weighted average shares and assumed conversion |
132.4
|
132.3
|
132.1
|
132.7
|
| Basic |
|
|
|
|
| Continuing operations |
$ 1.28
|
$ 1.31
|
$ 2.39
|
$ 2.33
|
| Discontinued operations |
0.00
|
0.00
|
0.00
|
0.00
|
| Basic earnings per share |
1.28
|
1.31
|
2.39
|
2.33
|
| Diluted |
|
|
|
|
| Continuing operations |
1.27
|
1.30
|
2.37
|
2.30
|
| Discontinued operations |
0.00
|
(0.01)
|
0.00
|
0.01
|
| Diluted earnings per share |
$ 1.27
|
$ 1.29
|
$ 2.37
|
$ 2.31
|
| Employee Stock Option [Member] |
|
|
|
|
| Diluted |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |
0.0
|
0.6
|
0.0
|
0.0
|