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v3.19.1

Equity and Noncontrolling Interests - Changes in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | $ 2,717 |
Balance at end of period | $ 2,630 | $ 4,395 | 2,630 | $ 4,395
Accumulated other comprehensive income (loss), end of period |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (518) | (336) | (531) | (397)
Aggregate adjustment for the period, net of tax | 35 | 132 | 51 | 203
Net reclassifications to AOCI | 0 | 9 | 0 | 9
Balance at end of period | (479) | (185) | (479) | (185)
Foreign currency translation adjustments |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (507) | (327) | (523) | (398)
Balance at end of period | (472) | (195) | (472) | (195)
Realized and unrealized gains (losses) on derivatives |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (10) | (7) | (7) | 3
Current period changes in fair value, net of tax | 4 | 11 | 1 | 1
Reclassification to income, net of tax | 0 | (1) | 0 | (1)
Balance at end of period | (6) | 3 | (6) | 3
Pension and postretirement plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1) | (2) | (1) | (2)
Balance at end of period | $ (1) | $ 7 | $ (1) | $ 7

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