Condensed Consolidated Statement of Operations - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sales:        
Product sales $ 1,101 $ 1,138 $ 2,069 $ 2,173
Service sales 210 203 411 394
Total sales 1,311 1,341 2,480 2,567
Costs, expenses and other:        
Product cost of sales 760 794 1,451 1,512
Service cost of sales 147 143 292 282
Selling, general and administrative expenses 160 152 323 289
Interest expense 17 15 32 30
Other income, net (8) (4) (10) (5)
Total costs, expenses and other 1,076 1,100 2,088 2,108
Income from continuing operations before income taxes 235 241 392 459
Income tax expense 63 78 87 127
Income from continuing operations 172 163 305 332
Income (loss) from discontinued operations, net of taxes (1) (6) 1 (8)
Net income $ 171 $ 157 $ 306 $ 324
Basic        
Continuing operations $ 1.31 $ 1.23 $ 2.33 $ 2.50
Discontinued operations 0.00 (0.04) 0.00 (0.06)
Basic earnings per share 1.31 1.19 2.33 2.44
Diluted        
Continuing operations 1.30 1.22 2.30 2.48
Discontinued operations (0.01) (0.05) 0.01 (0.06)
Diluted earnings per share $ 1.29 $ 1.17 $ 2.31 $ 2.42
Weighted average common shares:        
Basic 130.8 132.2 131.1 132.6
Diluted 132.3 133.7 132.7 134.1
Cash dividends per share $ 0.33 $ 0.30 $ 0.66 $ 0.60