Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Stockholders' Equity and EPS - Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 14, 2021	Mar. 22, 2021	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock, shares, issued			54,530,307	51,888,463
Common Stock
Class of Stock [Line Items]
Common stock, shares, issued	300,000	2,000,000
Shares Issued, Price Per Share		$ 500.00
Net proceeds after deducting discounts and commissions	$ 146	$ 972