Stock-Based Compensation - Components of Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Restricted stock and RSUs | $ 484 | $ 421 | $ 415 |
| Total stock-based compensation | 514 | 453 | 448 |
| Long-Term Incentive Plans Funded by PNC [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Restricted stock and RSUs | $ 30 | $ 32 | $ 33 |