Recent Accounting Pronouncements (Details) $ in Millions	Dec. 31, 2016 USD ($)
Retained Earnings \| Accounting Standards Update 2016-09, Excess Tax Benefit Component
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment	$ 13

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