Subsequent Events Subsequent Events (Details) $ in Millions	Oct. 16, 2016 USD ($)	Sep. 10, 2016 USD ($)
Save-A-Lot [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses	$ 1,365
Minimum [Member] | Save-A-Lot [Member]
Subsequent Event [Line Items]
Expected Disposal, Net Assets		$ 620
Future Remaining Proceeds From Divestiture of Businesses		275
Maximum [Member] | Save-A-Lot [Member]
Subsequent Event [Line Items]
Expected Disposal, Net Assets		630
Future Remaining Proceeds From Divestiture of Businesses		$ 350
Term Loan Credit Facility [Member] | Term Loan [Member]
Subsequent Event [Line Items]
Ratio of Indebtedness to Net Capital		1.50
Term Loan Credit Facility [Member] | Term Loan [Member] | Minimum [Member]
Subsequent Event [Line Items]
Debt Instrument, Prepayment Of Loan, Cash Proceeds		$ 750
Term Loan Credit Facility [Member] | Term Loan [Member] | Minimum [Member] | Save-A-Lot [Member]
Subsequent Event [Line Items]
Expected Disposal, Additional Loan Repayment		50
Term Loan Credit Facility [Member] | Term Loan [Member] | Maximum [Member] | Save-A-Lot [Member]
Subsequent Event [Line Items]
Expected Disposal, Additional Loan Repayment		$ 100