(Dollars in Millions)  | Debt Instruments  | Equity Securities  | Commingled Funds  | Insurance Contracts  | Other Assets  | Total Level 3  | |||||||||||||
Balance January 1, 2012  | $  | 9  | 16  | 33  | 25  | 65  | 148  | ||||||||||||
Realized gains (losses)  | —  | (1  | )  | —  | —  | (5  | )  | (6  | )  | ||||||||||
Unrealized gains (losses)  | —  | —  | —  | —  | —  | —  | |||||||||||||
Purchases, sales, issuances and settlements, net  | (6  | )  | (11  | )  | 17  | (1  | )  | 9  | 8  | ||||||||||
Balance December 30, 2012  | 3  | 4  | 50  | 24  | 69  | 150  | |||||||||||||
Realized gains (losses)  | —  | —  | —  | —  | (5  | )  | (5  | )  | |||||||||||
Unrealized gains (losses)  | —  | (1  | )  | —  | (1  | )  | —  | (2  | )  | ||||||||||
Purchases, sales, issuances and settlements, net  | (2  | )  | 1  | (6  | )  | —  | 5  | (2  | )  | ||||||||||
Balance December 29, 2013  | $  | 1  | 4  | 44  | 23  | 69  | 141  | ||||||||||||