|
Notes Payable and Long-term Debt (Schedule of Notes Payable and Long-term Debt) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Total debt issued and outstanding | $ 4,731 | $ 4,605 |
|
Face 575 Million Notes due 2014 One Point Four Percent [Member]
|
||
| Total debt issued and outstanding | 0 | 573 |
| Interest rate on borrowed funds | 1.40% | |
|
Face 400 Million Notes due 2015 1 Point 625 Percent [Member]
|
||
| Total debt issued and outstanding | 0 | 397 |
| Interest rate on borrowed funds | 1.625% | |
|
Face 251 Million Debentures due 2018 6 Point 75 Percent [Member]
|
||
| Total debt issued and outstanding | 251 | 251 |
| Interest rate on borrowed funds | 6.75% | |
|
Face 340 Million Debentures due 2018 6 Point 40 Percent [Member]
|
||
| Total debt issued and outstanding | 338 | 338 |
| Interest rate on borrowed funds | 6.40% | |
|
Face 500 Notes due 2020 4 point 40 Percent [Member]
|
||
| Total debt issued and outstanding | 497 | 496 |
| Interest rate on borrowed funds | 4.40% | |
|
Face 1000 Million Notes due 2020 3 Point 125 Percent [Member]
|
||
| Total debt issued and outstanding | 991 | 989 |
| Interest rate on borrowed funds | 3.125% | |
|
Face 1,100 Million Notes Due 2022 Two Point Five Zero Five Percent [Member] [Member]
|
||
| Total debt issued and outstanding | 1,092 | 0 |
| Interest rate on borrowed funds | 2.50% | |
|
Face 382 Million Debentures due 2027 Seven Point Two Zero Percent [Member]
|
||
| Total debt issued and outstanding | 368 | 367 |
| Interest rate on borrowed funds | 7.20% | |
|
Face 185 Million Debentures due 2028 Seven Point Zero Zero Percent [Member]
|
||
| Total debt issued and outstanding | 184 | 184 |
| Interest rate on borrowed funds | 7.00% | |
|
Face 600 Million Notes due 2040 Four Point Eight Seven Five Percent [Member]
|
||
| Total debt issued and outstanding | 591 | 591 |
| Interest rate on borrowed funds | 4.875% | |
|
Face 425 Million Notes Due 2041 Four Point Seven Percent [Member]
|
||
| Total debt issued and outstanding | $ 419 | $ 419 |
| Interest rate on borrowed funds | 4.70% |