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Equity and Noncontrolling Interests Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |
Accumulated other comprehensive loss, end of period |  |  | $ (795) | $ (946) | $ (473) |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |
Divestiture of Power Solutions |  |  | 6 | (29) | (14) |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |  |
Reclassification to income | [1] |  | 0 | (1) | 0 |
Current period changes in fair value, tax |  |  | 0 | (1) | 0 |
Pension and postretirement plans |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | 1,000 |  |  | $ 8,500
Proceeds from Sale and Maturity of Marketable Securities |  |  |  | 3 |  |
Marketable Securities, Realized Gain (Loss) |  |  |  | 2 |  |
Foreign Currency Translation |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
Balance at beginning of period |  | $ (939) | (939) | (481) | (1,152) |
Aggregate adjustment for the period | [2] |  | (325) | (458) | 108 |
Adient spin-off impact |  |  | 0 | 0 | 563 |
Balance at end of period |  |  | (785) | (939) | (481) |
Aggregate adjustment for the period, tax |  |  | 0 | (3) | 1 |
Realized And Unrealized Gains Losses On Derivatives |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax |  |  | 2 | (5) | (10) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax |  |  | (1) | (4) | 4 |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |
Balance at beginning of period |  | (13) | (13) | 6 | 4 |
Current period changes in fair value |  |  | (1) | (8) | 9 |
Reclassification to income | [3] |  | 8 | (11) | (23) |
Adient spin-off impact |  |  | 0 | 0 | 16 |
Balance at end of period |  |  | (2) | (13) | 6 |
Other Comprehensive Income, Unrealized Gain on Derivatives Arising Due to Adient spin-off, Tax |  |  | 0 | 0 | 6 |
Unrealized Gain Loss On Marketable Securities |  |  |  |  |  |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |  |
Balance at beginning of period |  | 8 | 8 | 4 | (1) |
Current period changes in fair value |  |  | 0 | 5 | 5 |
Balance at end of period |  |  | 0 | 8 | 4 |
Current period changes in fair value, tax |  |  | 0 | 1 | 1 |
Pension And Other Postretirement Benefit Plans Assets |  |  |  |  |  |
Pension and postretirement plans |  |  |  |  |  |
Balance at beginning of period |  | (2) | (2) | (2) | (4) |
Other changes |  |  | 6 | 0 | 0 |
Adient spin-off impact |  |  | 0 | 0 | 2 |
Balance at end of period |  |  | (8) | (2) | (2) |
Reclassification to income, tax |  |  | 0 | 0 | 0 |
Other changes (tax) |  |  | 0 | 0 | 0 |
Other Comprehensive Income, Pension and Other Postretirement Benefit Plan, Tax, due to Adient spin-off |  |  |  | 0 |  |
Power Solutions |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | 479 | 0 | 0 |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |
Divestiture of Power Solutions |  |  | 4 | 0 | 0 |
Pension and postretirement plans |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  | 479 | 0 | 0 |
Power Solutions | Realized And Unrealized Gains Losses On Derivatives |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax |  |  | 1 | 0 | 0 |
Scott Safety business [Member] |  |  |  |  |  |
Foreign currency translation adjustments |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  |  | 12 |  |
Pension and postretirement plans |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax |  |  |  | 12 |  |
Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |  |
Accounting Pronouncement |  |  | 0 |  |  |
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |  |
Accounting Pronouncement |  |  | (8) | $ 0 | $ 0 |
Retained Earnings | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |
Realize and unrealized gains (losses) on marketable securities |  |  |  |  |  |
Accounting Pronouncement |  | $ 8 | $ 8 |  |  |
[1] | **** During fiscal 2018, the Company sold certain marketable common stock for approximately $3 million. As a result, the Company recorded $2 million of realized gains within selling, general and administrative expenses.
[2] | * During fiscal 2018, $12 million of cumulative CTA was recognized as part of the divestiture-related gain recognized as part of the divestiture of Scott Safety.
[3] | ** Refer to Note 10, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items on the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.

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