Investments in The Kraft Heinz Company - Narrative (Detail)				1 Months Ended		3 Months Ended
	Jul. 02, 2015 shares	Jul. 01, 2015 USD ($) shares	Jun. 07, 2013 USD ($) shares	Jun. 30, 2015 $ / shares shares	Mar. 31, 2015 $ / shares	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Jun. 07, 2016 USD ($)
Kraft Heinz (previously Heinz Holding) [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Reverse stock split ratio		0.443332
Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage		52.50%
Equity method investment ownership percentage after transactions	26.80%
Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Number of shares acquired | shares		262,900,000	425,000,000
Number of shares acquired upon exercise of warrants | shares				46,000,000
Exercise price for warrants, per share | $ / shares				$ 0.01
Purchase of common stock		$ 5,260,000,000
Investment, number of shares owned | shares		325,400,000
Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member] | Cumulative Compounding Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Investment in preferred stock, liquidation value			$ 8,000,000,000
Investment in preferred stock, stated dividend rate						9.00%
Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member] | Common Stock, Cumulative Compounding Preferred Stock and Warrants [Member]
Schedule of Equity Method Investments [Line Items]
Purchase of preferred stock, common stock and warrants			$ 12,250,000,000
Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway Inc. and 3G Capital [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage after transactions	51.00%
Kraft Heinz (previously Heinz Holding) [Member] | 3G Capital (venture partner) [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage after transactions	24.20%
Kraft Heinz (previously Heinz Holding) [Member] | 3G Capital (venture partner) [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Number of shares acquired | shares		237,100,000	425,000,000
Purchase of common stock		$ 4,740,000,000	$ 4,250,000,000
Interest, Dividend and Other Investment Income [Member] | Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member]
Schedule of Equity Method Investments [Line Items]
Equity method earnings on common stock and dividends earned on preferred stock						$ 240,000,000	$ 231,000,000
Management and Directors [Member] | Kraft Heinz (previously Heinz Holding) [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Common shares reserved for issuance under equity grants, including stock options | shares			39,600,000
Scenario, Forecast [Member] | Kraft Heinz (previously Heinz Holding) [Member] | Berkshire Hathaway (Parent) [Member] | Cumulative Compounding Preferred Stock [Member]
Schedule of Equity Method Investments [Line Items]
Investment in preferred stock, liquidation value								$ 8,300,000,000
Kraft [Member]
Schedule of Equity Method Investments [Line Items]
Minimum annual revenues of Kraft						$ 18,000,000,000
Kraft [Member] | Kraft Heinz (previously Heinz Holding) [Member]
Schedule of Equity Method Investments [Line Items]
Ratio of common stock shares to be issued per Kraft common stock share					1
Dividend to be received by Kraft shareholders per share | $ / shares					$ 16.50
Kraft [Member] | Kraft Heinz (previously Heinz Holding) [Member] | Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Number of new shares issued to former Kraft shareholders | shares	593,000,000