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Equity and Noncontrolling Interests - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Sep. 30, 2019
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ (534) | $ (1,066) | $ (939) | $ (785) |  | $ (939) |  |
Aggregate adjustment for the period |  | (471) | 114 |  | (220) |  | (13) |  |
Aggregate adjustment for period, tax effect |  | 0 | 0 |  | 0 |  | 0 |  |
Balance at end of period |  | (1,005) | (952) | (1,066) | (1,005) |  | (952) |  |
Realized and unrealized gains (losses) on derivatives |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | 3 | (12) | (13) | (2) |  | (13) |  |
Current period change in fair value |  | (8) | 12 |  | (3) |  | 8 |  |
Current period change in fair value, Tax |  | (3) | 6 |  | (1) |  | 4 |  |
Reclassification to income | [1] | (2) | 2 |  | (2) |  | 7 |  |
Reclassifcation to income, tax effect |  | 0 | 2 |  | 0 | [1] | 3 | [1] |
Balance at end of period |  | (7) | 2 | (12) | (7) |  | 2 |  |
Realized and unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 8 | 0 |  | 8 |  |
Balance at end of period |  | 0 | 0 |  | 0 |  | 0 |  |
Pension and postretirement plans |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | (9) | (2) | (2) | (8) |  | (2) |  |
Reclassification to income |  | 0 | 0 |  | (1) |  | 0 |  |
Reclassification to income, tax effect |  | 0 | 0 |  | 0 |  | 0 |  |
Balance at end of period |  | (9) | (2) | (2) | (9) |  | (2) |  |
Accumulated other comprehensive loss |  | $ (1,021) | $ (952) |  | (1,021) |  | (952) |  | $ (795)
Adoption of ASU 2016-01 |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  |
Accounting Pronouncement |  |  |  | $ (8) | $ 0 | [2] | 0 |  |
Retained Earnings | Adoption of ASU 2016-01 |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  |
Accounting Pronouncement |  |  |  |  |  |  | 8 |  |
AOCI Attributable to Parent [Member] | Adoption of ASU 2016-01 |  |  |  |  |  |  |  |  |
Realized and unrealized gains (losses) on marketable securities |  |  |  |  |  |  |  |  |
Accounting Pronouncement | [2] |  |  |  |  |  | $ (8) |  |
[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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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
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