Share-Based Compensation (Stock Option Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Options (Number of Shares):
Exercised	(1,000)
Stock Options
Options (Number of Shares):
Outstanding at beginning of period	7,883
Exercised	(1,349)
Forfeited and expired	(1,097)
Granted	1,428
Outstanding at end of period	6,865
Vested and expected to vest at end of period	6,618
Eligible for exercise at end of period	4,646
Weighted Average Exercise Price (in dollars per share):
Outstanding at beginning of period	$ 14.91
Exercised	$ 9.56
Forfeited and expired	$ 16.70
Granted	$ 11.25
Outstanding at end of period	$ 14.91
Vested and expected to vest at end of period	$ 15.04
Eligible for exercise at end of period	$ 16.42
Outstanding, weighted average remaining contractual term (in years)	5 years 1 month 6 days
Vested and expected to vest, weighted average remaining contractual term (in years)	5 years
Eligible for exercise, weighted average remaining contractual term (in years)	3 years 7 months 6 days
Outstanding, intrinsic value	$ 12
Vested and expected to vest, intrinsic value	11
Eligible for exercise, intrinsic value	$ 6