Stockholders' Equity - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
Equity [Abstract]
Estimated after-tax loss on derivatives to be reclassified from AOCI to earnings within the next 12 months	$ 4

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

No definition available.

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