| In millions, except per share items | Sep-30-19 | Mar-31-19 | Sep-30-18 | Jun-30-18 | Mar-31-18 | Sep-30-17 | Jun-30-17 | Mar-31-17 |
| | 6-K | 6-K | 6-K | 6-K | 6-K | 6-K | 6-K | 6-K |
| Revenues | | | | | | | | |
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| Operating income (expenses) | | | | | | | | |
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| Other comprehensive income (loss), before tax | | | | | | | | |
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| Income tax expense related to components of other comprehensive income | | | | | | | | |
| Other comprehensive income (loss), net of tax | | | | | | | | |
| Comprehensive income (loss) | | | | | | | | |
| Comprehensive income (loss) attributable to noncontrolling interests | | | | | | | | |
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| Earnings (loss) per share for Class A and Class B ordinary shares | | | | | | | | |
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| Earnings (loss) per share for Class A and Class B ordinary shares from continuing operations | | | | | | | | |
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| Earnings per share for Class A and Class B ordinary shares from discontinued operations | | | | | | | | |
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| Weighted average number of Class A and Class B ordinary shares outstanding: | | | | | | | | |