Commitments and Contingencies - Purchase Commitments (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Amount of agreements to purchase goods and services	$ 312

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

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