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Equity and Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward] |  |  |  |  |  |
Realized and unrealized gains (losses) on derivatives | $ (9) | $ 1 | $ 10 | $ (10) |  |
Parent |  |  |  |  |  |
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward] |  |  |  |  |  |
Realized and unrealized gains (losses) on derivatives | $ (5) | 3 | $ 10 | (2) |  |
Redeemable Noncontrolling Interests [Member] |  |  |  |  |  |
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward] |  |  |  |  |  |
Beginning balance |  | 231 |  | 231 | $ 235 | $ 211
Net income |  | 10 |  | 35 |  |
Foreign currency translation adjustments |  | (13) |  | (3) |  |
Realized and unrealized gains (losses) on derivatives |  | (1) |  | (9) |  |
Dividends |  |  |  | (3) |  |
Ending balance |  | $ 231 |  | $ 231 | $ 235 | $ 211

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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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