|
Stock-based Compensation Plans (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
| Stock-based compensation expense |
$ 122 |
$ 102 |
$ 128 |
| Stock-based compensation tax benefit |
37 |
34 |
43 |
| Compensation expense related to nonvested awards not yet recognized |
171 |
|
|
| Compensation expense related to nonvested awards expected to be recognized over a weighted-average period, years |
1 year 7 months |
|
|
| Shares authorized under the 2001 stock plan and 1997 nonemployee Directors Restricted Stock Plan |
41,800,000 |
|
|
| Shares available for awards under the 2001 stock plan and 1997 nonemployee Directors Restricted Stock Plan |
8,300,000 |
|
|
| Return on invested capital, weighted |
50.00% |
|
|
| Total shareholder return relative to a peer group, weighted |
25.00% |
|
|
| Cumulative free cash flow, weighted |
25.00% |
|
|
| Options vested |
0 |
0 |
|
| Total intrinsic value of options exercised |
$ 38 |
$ 29 |
$ 51 |
| Weighted average exercise price of shares exercisable |
$ 31.56 |
|
|
| Share-based compensation arrangement by share-based payment award, options, exercisable, number |
889,000 |
4,398,000 |
6,450,000 |
| Restricted Stock Unit Awards Granted From Stock Plans Based on Performance Cycle |
3 years |
|
|
|
Minimum [Member]
|
|
|
|
| Target award |
0.00% |
|
|
|
Maximum [Member]
|
|
|
|
| Target award |
200.00% |
|
|
| Weighted average exercise price of shares exercisable |
$ 31.56 |
$ 38.98 |
$ 37.23 |
|
Employee Stock Option [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
4 years |
|
|
|
Nondirector [Member]
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
1 year |
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