Accounts Payable (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts Payable [Line Items]
Checks Issued In Excess Of Associated Bank Balances But Not Yet Presented For Collection	$ 110	$ 117

Checks Issued In Excess Of Associated Bank Balances But Not Yet Presented For Collection

No definition available.

Name:	s_ChecksIssuedInExcessOfAssociatedBankBalancesButNotYetPresentedForCollection
Namespace Prefix:	s_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant