The following table provides the contractual maturities of the available-for-sale and held-to-maturity debt securities:  | ||||||||||||||||||||
Years  | ||||||||||||||||||||
Over 1  | Over 5  | December 31,  2013  | ||||||||||||||||||
(MILLIONS OF DOLLARS)  | Within 1  | to 5  | to 10  | Over 10  | Total  | |||||||||||||||
Available-for-sale debt securities  | ||||||||||||||||||||
Western European, Scandinavian and other government debt(a)  | $  | 10,253  | $  | 2,380  | $  | —  | $  | —  | $  | 12,633  | ||||||||||
Corporate debt(b)  | 3,997  | 4,822  | 1,236  | 302  | 10,357  | |||||||||||||||
Reverse repurchase agreements(c)  | 3,519  | —  | —  | —  | 3,519  | |||||||||||||||
Federal Home Loan Mortgage Corporation and Federal National Mortgage Association asset-backed securities  | —  | 2,593  | 10  | 303  | 2,906  | |||||||||||||||
Western European, Scandinavian and other government agency debt(a)  | 1,686  | 453  | —  | —  | 2,139  | |||||||||||||||
Supranational debt(a)  | 1,006  | 1,009  | —  | —  | 2,015  | |||||||||||||||
Government National Mortgage Association and other U.S. government guaranteed asset-backed securities  | 705  | 159  | —  | 41  | 905  | |||||||||||||||
U.S. government debt  | 185  | 222  | 18  | —  | 425  | |||||||||||||||
Held-to-maturity debt securities  | ||||||||||||||||||||
Western European, Scandinavian and other government debt(a)  | 5,909  | —  | —  | —  | 5,909  | |||||||||||||||
Western European, Scandinavian and other government agency debt, certificates of deposit and other(a)  | 3,113  | 117  | —  | —  | 3,230  | |||||||||||||||
Total debt securities  | $  | 30,373  | $  | 11,755  | $  | 1,264  | $  | 646  | $  | 44,038  | ||||||||||
(a)   | All issued by above-investment-grade governments, government agencies or supranational entities, as applicable.  | 
(b)   | Largely issued by above-investment-grade institutions in the financial services sector.  | 
(c)   | Involving U.S. securities.  |