Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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(28))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Earnings Per Share - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Stock Repurchased and Retired [Line Items]
Stock Repurchased During Period, Value	$ 368		$ 24	$ 516	$ 24
Common Stock
Stock Repurchased and Retired [Line Items]
Repurchase of common stock (in shares)	11,073	(3,700)	1,187	15,578	1,187
Stock Repurchased During Period, Value		$ 119
Parent
Stock Repurchased and Retired [Line Items]
Stock Repurchased During Period, Value	$ 368		$ 24	$ 516	$ 24
Preferred Stock
Stock Repurchased and Retired [Line Items]
Stock Repurchased and Retired During Period, Shares	1,000			1,000
Common Stock and Preferred Stock
Stock Repurchased and Retired [Line Items]
Stock Repurchased During Period, Value	$ (396)