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Equity and Noncontrolling Interests - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions

3 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Sep. 30, 2019

Sep. 30, 2018

Accumulated Other Comprehensive Income (Loss) [Line Items]

AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax

$ 3

$ (12)

$ (2)

$ (13)

Foreign currency translation adjustments

Balance at beginning of period

(785)

(939)

Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent

251

(127)

Balance at end of period

(534)

(1,066)

Realized and unrealized gains (losses) on derivatives

Current period changes in fair value

7

2

Realized and unrealized gains (losses) on marketable securities

Balance at beginning of period

0

8

Balance at end of period

0

0

Reclassification to income, tax effect

Pension and postretirement plans

Balance at beginning of period

(8)

(2)

Reclassification to income

(1)

0

Balance at end of period

(9)

(2)

Accumulated other comprehensive loss

(540)

(1,080)

$ (795)

Foreign currency translation adjustments

Foreign currency translation adjustments

Aggregate adjustment for period, tax effect

0

0

Realized and unrealized gains (losses) on derivatives

Realized and unrealized gains (losses) on derivatives

Current period changes in fair value

5

(4)

Reclassification to income

^[1]

0

5

Current period changes in fair value, tax effect

2

(2)

Reclassifcation to income, tax effect

0

1

Pension and postretirement plans

Pension and postretirement plans

Reclassification to income, tax effect

0

0

Adoption of ASU 2016-01

Accumulated Other Comprehensive Income (Loss) [Line Items]

Cumulative Effect on Retained Earnings, Net of Tax

0

^[2]

0

Other Comprehensive Income Loss ASU201601 Adoption Impact

^[2]

8

Retained Earnings | Adoption of ASU 2016-01

Accumulated Other Comprehensive Income (Loss) [Line Items]

Cumulative Effect on Retained Earnings, Net of Tax

8

AOCI Attributable to Parent [Member] | Adoption of ASU 2016-01

Accumulated Other Comprehensive Income (Loss) [Line Items]

Cumulative Effect on Retained Earnings, Net of Tax

(8)

Power Solutions | Realized and unrealized gains (losses) on derivatives

Realized and unrealized gains (losses) on derivatives

Current period changes in fair value, tax effect

[1]	* Refer to Note 16, "Derivative Instruments and Hedging Activities," of the notes to consolidated financial statements for disclosure of the line items in the consolidated statements of income affected by reclassifications from AOCI into income related to derivatives.
[2]	** During the quarter ended December 31, 2018, the Company adopted ASU 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities." As a result, the Company reclassified $8 million of unrealized gains on marketable securities to retained earnings as of October 1, 2018.

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