Common Stock (Details) (USD $)
Share data in Millions, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | |||
---|---|---|---|---|---|---|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
May 31, 2013
Common Stock [Member]
|
Dec. 31, 2013
Common Stock [Member]
|
Dec. 31, 2012
Common Stock [Member]
|
|
Equity, Class of Treasury Stock [Line Items] | ||||||
Common stock repurchased | 13.2 | 6.9 | ||||
Payments for repurchase of common stock | $ 550,000,000 | $ 230,000,000 | $ 361,000,000 | |||
Stock repurchase program, authorized amount | 1,000,000,000 | |||||
Stock repurchase program, remaining authorized repurchase amount | $ 563,000,000 |