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Guarantor Financial Information - Narrative (Details) - USD ($) $ in Millions	Oct. 30, 2015	Apr. 24, 2015
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries	$ 0	$ 0
Subsidiary Issuer [Member] | CIFSA Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries	$ 8,794	4,277
Subsidiary Issuer [Member] | CIFSA Notes [Member] | Restatement adjustment [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries		2,763
Subsidiary Issuer [Member] | CIFSA Notes [Member] | Restatement adjustment [Member] | Internal reorganization [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries		1,093
Subsidiary Issuer [Member] | CIFSA Notes [Member] | Restatement adjustment [Member] | Intercompany dividend [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiaries		$ 1,670

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