|
Debt (Details 3) (USD $)
In Millions, unless otherwise specified |
0 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|---|---|---|---|
|
May 31, 2012
|
Jun. 30, 2013
|
Dec. 31, 2012
|
Feb. 07, 2013
1.50% Series C Convertible Senior Notes due December 2037
|
Jun. 30, 2012
1.50% Series C Convertible Senior Notes due December 2037
|
Jun. 30, 2012
1.50% Series C Convertible Senior Notes due December 2037
|
Dec. 31, 2012
1.50% Series C Convertible Senior Notes due December 2037
|
Jun. 30, 2013
1.50% Series C Convertible Senior Notes due December 2037
Maximum
|
Jun. 30, 2013
1.50% Series C Convertible Senior Notes due December 2037
Maximum
|
|
| Carrying amounts of Convertible Senior Notes | |||||||||
| Interest expense | $ 22 | $ 43 | $ 1 | $ 1 | |||||
| Carrying amount of liability component | 10,799 | 12,459 | 62 | ||||||
| Carrying amount of equity component | 10 | ||||||||
| Aggregate principal amount of debt redeemed | 148 | 62 | |||||||
| Aggregate cash payments to redeem debt | $ 62 |