Amount, before allowance for credit loss, of financing receivable.

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Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Receivables (Narrative) (Details) - IPL [Member] - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
Forecast [Member] \| Subsequent Event
Receivables [Line Items]
Limit on cash proceeds to be received from third-party	$ 110
Receivables Sold [Member]
Receivables [Line Items]
Available capacity		$ 15
Receivables Sold [Member] \| Financial Asset, Past Due
Receivables [Line Items]
Outstanding receivables past due		$ 22