|
Summary of Reconciliation of Reportable Segment Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|---|
| Segment Reporting Disclosure [Line Items] | |||
| Assets | $ 274,098 | $ 225,222 | |
|
Operating Segments
|
|||
| Segment Reporting Disclosure [Line Items] | |||
| Assets | 231,002 | 227,300 | 233,563 |
|
Corporate, Eliminations and Other
|
|||
| Segment Reporting Disclosure [Line Items] | |||
| Assets | $ 43,096 | $ (2,078) |