Equity - Statements of Redeemable Equity (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Temporary Equity
Share-based Payments Subject to Redemption, Beginning Balance	$ 28	$ 21	$ 30	$ 27	$ 23	$ 31	$ 30	$ 31
Share-based compensation, net of issuance	4	7	(9)	5	4	(8)	2	1
Share-based Payments Subject to Redemption, Ending Balance	32	28	21	32	$ 27	$ 23	32	32
Redeemable Non-Controlling Interests, Beginning Balance	70	70	70				70
Net income (loss) attributable to non-controlling interests	(2)		(1)	(2)			(3)	(2)
Acquisition of redeemable non-controlling interests				74				74
Other comprehensive (loss) income			1	2			1	2
Redeemable Non-Controlling Interests, Ending Balance	$ 68	$ 70	$ 70	$ 74			$ 68	$ 74

Value of acquisition of redeemable noncontrolling interests attributable to temporary equity during the period.

No definition available.

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- Definition

The portion of other comprehensive income or loss attributable to temporary equity interest.

+ References

No definition available.

+ Details

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- Definition

Increase (decrease) in temporary equity for share-based compensation, net of issuance during the period.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 3A
-Subparagraph (16)(c)
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- Definition

Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
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-Section S99
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- Definition

The portion of net income or loss attributable to temporary equity interest.

+ References

No definition available.

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