Fair Value (Schedule of Financial Assets and Liabilities Carried at Fair Value on a Recurring Basis) (parenthetical) (Details) $ in Millions	6 Months Ended
Dec. 31, 2020 USD ($)
Fair value measurements recurring \| Flutter Entertainment "Plc" \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Payments to acquire investments	$ 55

Amount of cash outflow to acquire investments classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireOtherInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration