Earnings Per Common Share (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Antidilutive securities excluded from computation of earnings per share
Repurchase and retirement of common stock to offset the dilutive impact of long-term stock awards	1,700,000
Repurchase and retirement of common stock cash aggregate to offset the dilutive effect	$ 39	$ 35
Remaining number of shares authorized to be repurchased	20,900,000
Cash dividends per common share paid (in dollars per share)	$ 0.075	$ 0.075
Cash dividends per common share declared (in dollars per share)	$ 0.075	$ 0.075
Stock options
Antidilutive securities excluded from computation of earnings per share
Antidilutive effect on computation of diluted earnings per common share (in shares)	11,000,000	15,000,000
Unvested stock awards
Antidilutive securities excluded from computation of earnings per share
Grant of long-term stock awards	1,600,000