Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

No definition available.

Name:	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative effect on equity in period of adoption		$ (15)	$ 58
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Expected effect of new accounting pronouncement	$ (50)