Commitments and Contingencies Commitments and Contingencies - Cash Proceeds after Year-End (Details) - Fire [Member] - USD ($) $ in Millions	1 Months Ended	12 Months Ended
Feb. 25, 2017	Jan. 28, 2017
Subsequent Event [Line Items]
Insurance Proceeds, Advance of Funds		$ 174
Subsequent Event [Member]
Subsequent Event [Line Items]
Insurance Proceeds, Advance of Funds	$ 73

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration