Summary of Significant Accounting Policies New Accounting Guidance (Details) $ in Billions	Jan. 01, 2020 USD ($)
Accounting Standards Update 2016-13 [Member] \| Forecast [Member]
Item Effected [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (1.1)

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

Name:	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant