Preferred Stock Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value	$ 40
Number Of Full Quarterly Dividend Payments In Default Before Preferred Stockholders Elect Board Of Directors	4
Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value	40
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	24,000	407,000
Preferred Stock, Value, Outstanding	2	41
Dividends Payable	0	1
Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Stated Value Per Share	$ 100	$ 100
Preferred Stock, Shares Authorized	3,500,000	3,500,000
Preferred Stock Class, 5% Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Stated Value Per Share	$ 100	$ 100
Preferred Stock, Shares Authorized	127,000	127,000
Preferred Stock, Dividend Rate, Percentage	5.00%	5.00%
Preferred Stock, Redemption Price Per Share	$ 110.0	$ 110.0
Preferred Stock Class, 5% Preferred [Member] | Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	126,000
Preferred Stock, Value, Outstanding	0	13
Preferred Stock Class, No Par Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, No Par Serial Preferred, Shares Authorized	16,000,000	16,000,000
Preferred Stock, No Par Serial Preferred Stock, Shares Issued	0	0
Preferred Stock, No Par Serial Preferred, Shares Outstanding	0	0
Serial Preferred Stock, 4.52 to 5.40 Percent Annual Dividend Rate [Member] | Preferred Stock Class, Serial Preferred [Member] | Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	0	257,000
Preferred Stock, Value, Outstanding	0	26
Serial Preferred Stock, 6.00 to 7.00 Percent Annual Dividend Rate [Member] | Preferred Stock Class, Serial Preferred [Member] | Nonredeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Outstanding	24,000	24,000
Preferred Stock, Value, Outstanding	$ 2	$ 2
Minimum [Member] | Serial Preferred Stock, 4.52 to 5.40 Percent Annual Dividend Rate [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	4.52%	4.52%
Preferred Stock, Redemption Price Per Share	$ 100.0	$ 100.0
Minimum [Member] | Serial Preferred Stock, 6.00 to 7.00 Percent Annual Dividend Rate [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	6.00%	6.00%
Maximum [Member] | Serial Preferred Stock, 4.52 to 5.40 Percent Annual Dividend Rate [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.40%	5.40%
Preferred Stock, Redemption Price Per Share	$ 103.5	$ 103.5
Maximum [Member] | Serial Preferred Stock, 6.00 to 7.00 Percent Annual Dividend Rate [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	7.00%	7.00%