|
Changes in Allowance for Loan Losses (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2013
|
Mar. 31, 2012
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] | ||
| Balance at beginning of period | $ 56 | $ 54 |
| Charge-offs | (4) | (5) |
| Recoveries | 1 | 1 |
| Provision for loan losses | 6 | |
| Balance at end of period | 59 | 50 |
|
Residential real estate mortgages
|
||
| Financing Receivable, Allowance for Credit Losses [Line Items] | ||
| Balance at beginning of period | 36 | 40 |
| Charge-offs | (2) | (3) |
| Recoveries | 1 | 1 |
| Provision for loan losses | 5 | (1) |
| Balance at end of period | 40 | 37 |
|
Home equity lines of credit
|
||
| Financing Receivable, Allowance for Credit Losses [Line Items] | ||
| Balance at beginning of period | 20 | 14 |
| Charge-offs | (2) | (2) |
| Provision for loan losses | 1 | 1 |
| Balance at end of period | $ 19 | $ 13 |