Stock Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 29, 2012	Dec. 31, 2013 2010 Plan [Member] Common Stock [Member]	Dec. 31, 2010 2010 Plan [Member] Common Stock [Member]	Dec. 31, 2013 Directors Plan [Member] Common Stock [Member]	Dec. 31, 2013 Restricted And Deferred Stock [Member]	Dec. 31, 2012 Restricted And Deferred Stock [Member]	Dec. 31, 2011 Restricted And Deferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares issuable under the stock compensation plan						50,000,000	1,000,000
Shares available to be granted					45,254,733		534,576
Total intrinsic value of options exercised			$ 37
Vesting period, in years								3 years
Pre-tax compensation expense								49	46	47
Deferred tax benefit								19	18	18
Unamortized compensation expense								58
Weighted-average period of recognition, in years								2 years
Weighted-average grant date fair value	49	53	54
Weighted-average grant date fair value, per share	$ 33.76	$ 28.77	$ 24.34
Total fair value, stock vested	$ 89	$ 81	$ 56
Stock options outstanding				0