Activity in Deferred Compensation Program (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |||||
---|---|---|---|---|---|---|
Jun. 30, 2012
|
Dec. 31, 2011
|
Jun. 30, 2012
Treasury Stock [Member]
|
Jun. 30, 2011
Treasury Stock [Member]
|
Jun. 30, 2012
Deferred Compensation Obligations
|
Jun. 30, 2011
Deferred Compensation Obligations
|
|
Stockholders Equity Note [Roll Forward] | ||||||
Balance at beginning of period | (2) | (2) | (2) | (2) | ||
Reinvested dividends | 0 | 0 | ||||
Benefit payments | 0 | 0 | ||||
Balance at end of period | (2) | (2) | (2) | (2) | ||
Balance at beginning of period | $ 7,645 | $ 7,035 | $ (88) | $ (103) | $ 88 | $ 103 |
Reinvested dividends | (2) | (2) | 2 | 2 | ||
Benefit payments | 14 | 19 | (14) | (19) | ||
Balance at end of period | $ 7,645 | $ 7,035 | $ (76) | $ (86) | $ 76 | $ 86 |