Acquisitions and Divestitures - Divestitures (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
Sep. 30, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 |
Divestiture Information [Line Items] | | | | | | | |
Net sales | | $ 5,126 | $ 5,503 | $ 14,767 | $ 16,490 | | |
Earnings before income taxes | | 744 | 796 | 1,855 | 3,165 | | |
Proceeds from divestiture of business | | | | 0 | 1,399 | | |
Total after-tax separation costs | | $ 37 | | $ 115 | | | |
Total after-tax separation costs per share | | $ 0.06 | | $ 0.18 | | | |
Income tax expense related to planned strategic repositioning actions | | $ 13 | | $ 41 | | | |
Pretax separation costs | | 28 | 0 | 83 | 0 | | |
After-tax separation costs | | 24 | | 74 | | | |
Gain on divestiture of business | | $ 0 | $ 0 | 0 | 932 | | |
Gain on divestiture of business, after tax | | | | 0 | 528 | | |
Scenario, Forecast [Member] | Minimum [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Total after-tax separation costs | | | | | | $ 200 | |
Total after-tax separation costs per share | | | | | | $ 0.30 | |
Scenario, Forecast [Member] | Maximum [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Total after-tax separation costs | | | | | | $ 250 | |
Total after-tax separation costs per share | | | | | | $ 0.38 | |
Power Transmission Solutions [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Proceeds from divestiture of business | | | | | 1,400 | | |
Gain on divestiture of business | | | | | 932 | | |
Gain on divestiture of business, after tax | | | | | $ 528 | | |
Gain on divestiture impact on diluted earnings per share | | | | | $ 0.77 | | |
Network Power [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Estimated cash to be received upon separation of business | | | | 4,000 | | | |
Net sales | | | | | | | $ 4,400 |
Earnings before income taxes | | | | | | | 255 |
Power Generation, Motors and Drives Businesses [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Net sales | | | | | | | 1,700 |
Estimated value to be received upon separation of businesses | | | | 1,200 | | | |
Earnings before income taxes | | | | | | | $ 105 |
Power Generation, Motors and Drives Businesses [Member] | Scenario, Forecast [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Discontinued operation, gain (loss) on disposal, after-tax | $ (100) | | | | | | |
Impact to diluted earnings per share of disposal gain (loss) on discontinued operations | $ (0.15) | | | | | | |
Combined, Network Power and Power Generation, Motors and Drives Businesses [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Potential U.S. tax costs due to repatriation of cash related to separation of businesses | | | | $ 200 | | | |
Potential U.S. tax cost due to repatriation of cash related to separation of businesses, per share | | | | $ 0.30 | | | |
Potential repatriation of cash related to separation of businesses | | | | $ 1,500 | | | |
Combined, Network Power and Power Generation, Motors and Drives Businesses [Member] | Minimum [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Estimated pretax gain (loss) to be recognized upon separation of businesses | | | | 450 | | | |
Estimated after-tax gain (loss) to be recognized upon separation of businesses | | | | $ (50) | | | |
Estimated after-tax gain (loss) to be recognized upon separation of businesses, per share | | | | $ (0.08) | | | |
Combined, Network Power and Power Generation, Motors and Drives Businesses [Member] | Maximum [Member] | | | | | | | |
Divestiture Information [Line Items] | | | | | | | |
Estimated pretax gain (loss) to be recognized upon separation of businesses | | | | $ 550 | | | |
Estimated after-tax gain (loss) to be recognized upon separation of businesses | | | | $ (150) | | | |
Estimated after-tax gain (loss) to be recognized upon separation of businesses, per share | | | | $ (0.23) | | | |