Accounting Standards (Details) - Accounting Standards Update 2016-02 $ in Millions	6 Months Ended
Jun. 30, 2019 USD ($)
Minimum
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 2,810
Maximum
New accounting pronouncement or change in accounting principle, effect of adoption, quantification	$ 2,900

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