Compensation Plans (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			3 Months Ended	12 Months Ended											0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 Chairman and Chief Executive Officer	Dec. 31, 2013 Chairman and Chief Executive Officer	Dec. 31, 2013 Stock Options	Dec. 31, 2012 Stock Options	Dec. 31, 2011 Stock Options	Dec. 31, 2013 Restricted Stock and Performance Restricted Stock Units	Dec. 31, 2012 Restricted Stock and Performance Restricted Stock Units	Dec. 31, 2011 Restricted Stock and Performance Restricted Stock Units	Dec. 31, 2013 Restricted Stock and Performance Restricted Stock Units Minimum	Dec. 31, 2013 Restricted Stock and Performance Restricted Stock Units Maximum	Dec. 31, 2013 Restricted stock	Dec. 31, 2013 Restricted Stock Units	Aug. 14, 2006 Restricted Stock Units Chairman and Chief Executive Officer	Dec. 31, 2013 Restricted Stock Units Chairman and Chief Executive Officer	Dec. 31, 2013 23.34 - 25.52 Stock Options	Dec. 31, 2013 27.11 - 28.35 Stock Options	Dec. 31, 2013 31.95 - 46.92 Stock Options
Shares Authorized under Stock Option Plan Exercise Price Range
Exercise Price Range, Lower Range Limit (in dollars per share)																		$ 23.34	$ 27.11	$ 31.95
Exercise Price Range, Upper Range Limit (in dollars per share)																		$ 25.52	$ 28.35	$ 46.92
Shares under Options (in shares)						2,222,000												456,000	342,000	1,424,000
Weighted Average Exercise Price (in dollars per share)						$ 35.77												$ 23.34	$ 28.35	$ 41.53
Weighted Average Remaining Contractual Term						5 years												4 years 1 month 6 days	4 years 9 months 18 days	5 years 3 months 18 days
Currently Exercisable - Shares Under Options (in shares)						1,281,000												262,000	162,000	857,000
Currently Exercisable - Weighted Average Exercise Price (in dollars per share)						$ 35.64												$ 23.34	$ 28.35	$ 40.78
Share-based Compensation Arrangement by Share-based Payment Award, Options Unvested
Unvested at the beginning of the period (in shares)						2,588,000
Granted (in shares)						499,000
Vested (in shares)						(2,042,000)
Forfeited (in shares)						(104,000)
Unvested at the end of the period (in shares)						941,000	2,588,000
Unvested at the beginning of the period, weighted average grant date fair value (in dollars per share)						$ 4.30
Granted, weighted average grant date fair value (in dollars per share)						$ 5.89	$ 6.34	$ 5.97
Vested, weighted average grant date fair value (in dollars per share)						$ 4.30
Forfeited, weighted average grant date fair value (in dollars per share)						$ 4.75
Unvested at the end of the period, weighted average grant date fair value (in dollars per share)						$ 5.09	$ 4.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Information
Total vesting date intrinsic values (at vesting) of shares under options vested						$ 12	$ 18	$ 16
Total intrinsic value of vested shares under options at the end of the period						5
Proceeds received from options exercised						18	52	31
Total intrinsic value (at exercise) of options exercised						25	51	13
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology
Implied volatility traded option on common stock period						30 days
Risk-free rate (as a percent)						0.78%	1.09%	2.58%
Expected life						4 years 6 months	5 years 10 months 24 days	6 years 6 months
Expected volatility (as a percent)						28.90%	32.70%	31.80%
Expected dividend yield (as a percent)						5.80%	5.90%	6.10%
Restricted Stock and Performance Restricted Stock Units
Stock-based awards, vesting period												3 years	5 years				10 years
Performance restricted stock unit is convertible into common stock (in shares)									1.00
Shares withheld to offset tax withholding obligations (in shares)									242,000	361,000	136,000
Weighted-average remaining vesting period of restricted stock and restricted stock units									2 years
Total fair values (at vesting) of restricted stock and restricted stock units vested									22	39	14
Unvested restricted stock and performance restricted stock units activity
Unvested at the beginning of the period (in shares)														145,000	1,220,000
Granted (in shares)														144,000	502,000	219,000
Vested (in shares)														(43,000)	(471,000)
Forfeited (in shares)														(20,000)	(43,000)
Unvested at the end of the period (in shares)														226,000	1,208,000
Unvested at the beginning of the period, Weighted Average Grant Date Fair Value (in dollars per share)														$ 27.24	$ 35.16
Granted, Weighted Average Grant Date Fair Value (in dollars per share)														$ 41.77	$ 45.96
Vested, Weighted Average Grant Date Fair Value (in dollars per share)														$ 31.65	$ 36.58
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)														$ 26.84	$ 41.79
Unvested at the end of the period, Weighted Average Grant Date Fair Value (in dollars per share)														$ 35.70	$ 38.82
Termination
Severance-related charges				26	27
Accelerated deferred compensation on termination					17
Severance payments and other costs				9	10
Employee Benefit Plan
Matching contribution by Company, maximum percentage of participant's eligible compensation	4.00%
Matching contributions to Employee Benefit Plan	$ 0.8	$ 0.8	$ 0.8