Number of new stock issued during the period.

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Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Equity (Share Issuance) (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended	6 Months Ended
	Jun. 14, 2021	Jun. 30, 2021	Jun. 30, 2021
Equity
Proceeds from issuance of shares			$ 66
2021 ATM Program
Equity
Maximum value shares to be issued	$ 400
Proceeds from issuance of shares		$ 66
Aggregate sale of shares (in shares)		15.2