Estimated Amortization Expense (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Expected Amortization Expense
Future Amortization Expense, Year One	$ 140
Future Amortization Expense, Year Two	228
Future Amortization Expense, Year Three	181
Future Amortization Expense, Year Four	149
Future Amortization Expense, Year Five	124
Servicing Rights
Expected Amortization Expense
Future Amortization Expense, Year One	136
Future Amortization Expense, Year Two	223
Future Amortization Expense, Year Three	179
Future Amortization Expense, Year Four	147
Future Amortization Expense, Year Five	122
Other Intangible Assets
Expected Amortization Expense
Future Amortization Expense, Year One	4
Future Amortization Expense, Year Two	5
Future Amortization Expense, Year Three	2
Future Amortization Expense, Year Four	2
Future Amortization Expense, Year Five	$ 2