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Segment Information - Summary of Investments (Parenthetical) (Detail) - Sony Life [member] - JP [member] € in Billions	12 Months Ended
	Dec. 31, 2019 EUR (€)
Disclosure Of Summarized Investment Per Segment [line items]
Off balance sheet investment in joint venture	€ 2.3
Potential Divestment In Associate [member]
Disclosure Of Summarized Investment Per Segment [line items]
Percentage of divestment in joint venture	50.00%

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