Investments - Schedule of Total Gains and Losses on Equity Securities (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Investments Schedule [Abstract]
Total gains (losses) recognized on equity securities	$ 6	$ 30	$ (23)	$ 13
Less: Net gains recognized on equity securities sold or impaired	0	29	0	5
Unrealized gains (losses) recognized on equity securities held at end of period	$ 6	$ 1	$ (23)	$ 8

No definition available.

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- Definition

Amount of realized gain (loss) on investment in equity security recognized from sale of security. Prior to the adoption of ASU 2016-01, this also includes other than temporary impairment losses on equity securities recognized in earnings during the period.

+ References

No definition available.

+ Details

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- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

+ Details

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