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Other investments - Narrative (Detail) - Available-for-sale Securities [Member]
3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Bank of America Corporation [Member] | Non-Cumulative Perpetual Preferred Stock [Member]  
Other Investments [Line Items]  
Investment, number of shares owned | shares 50,000
Investment in preferred stock, stated dividend rate 6.00%
Investment in preferred stock, liquidation value per share | $ / shares $ 100,000
Preferred stock redemption period start date May 07, 2019
Redemption value of Perpetual Preferred Stock, per share | $ / shares $ 105,000
Redemption value of Perpetual Preferred Stock, aggregate value | $ $ 5,250,000,000
Bank of America Corporation [Member] | Warrants Expiring 2021 [Member]  
Other Investments [Line Items]  
Number of common shares that can be purchased | shares 700,000,000
Aggregate cost to exercise warrants | $ $ 5,000,000,000
Exercise price for warrants, per share | $ / shares $ 7.142857
RBI [Member] | Class A 9% Cumulative Compounding Perpetual Preferred Stock [Member]  
Other Investments [Line Items]  
Investment in preferred stock, stated dividend rate 9.00%
Preferred stock redemption period start date Dec. 12, 2017
Stated value of equity securities | $ $ 3,000,000,000
Preferred stock redemption at option of holder start date Dec. 12, 2024
Preferred stock redemption price percentage 109.90%