Redeemable Noncontrolling Interests - Reconciliation of Changes in Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance, beginning of period	$ 105	$ 149	$ 100	$ 47
Initial fair value of redeemable noncontrolling interests of acquired businesses				102
Purchase of redeemable noncontrolling interest		(46)		(46)
Sale of redeemable noncontrolling interest	64		64
Cash contributions from redeemable noncontrolling interests	2		4
Net income (loss) attributable to redeemable noncontrolling interests	(2)		(3)	1
Other comprehensive income (loss) attributable to redeemable noncontrolling interests	5		9	(1)
Balance, end of period	$ 174	$ 103	$ 174	$ 103

Temporary Equity, additional capital contributions to the business from the noncontrolling interest party.

No definition available.

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- Definition

Decrease in temporary equity from a purchase or redemption of noncontrolling interests.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

Increase in temporary equity from sale of a portion of the parent's controlling interest.

+ References

No definition available.

+ Details

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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.

+ Details

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- Definition

Carrying amount, attributable to parent and noncontrolling interests, 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.27(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Adjustments to temporary equity resulting from foreign currency translation adjustments.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

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