Debt and Borrowing Arrangements (Details 5) In Millions, unless otherwise specified	0 Months Ended													3 Months Ended
	Mar. 11, 2014 Chesapeake Series 2014-1 Term notes USD ($)	Mar. 20, 2014 Chesapeake Series 2013-2 and Series 2013-3 notes USD ($)	Dec. 31, 2013 Chesapeake Series 2013-2 and Series 2013-3 notes USD ($)	Mar. 31, 2014 Secured Canadian Credit facility Maximum USD ($)	Mar. 21, 2014 Secured Canadian Credit facility Revolving capacity USD ($)	Mar. 21, 2014 Secured Canadian Credit facility Revolving capacity CAD	Dec. 31, 2013 Secured Canadian Credit facility Revolving capacity USD ($)	Dec. 31, 2013 Secured Canadian Credit facility Revolving capacity CAD	Feb. 04, 2014 Mortgage Asset-Backed Debt Wells Fargo Bank USD ($)	Dec. 31, 2013 Mortgage Asset-Backed Debt Wells Fargo Bank USD ($)	Mar. 31, 2014 Variable-funding notes USD ($)	Mar. 31, 2014 Variable-funding notes Maximum USD ($)	Mar. 10, 2014 Variable-funding notes Maximum PSART USD ($)	Mar. 31, 2014 4.0% Convertible notes due 2014 USD ($)	Mar. 31, 2014 6.0% Convertible Notes due 2017 USD ($)
Debt and Borrowing Arrangements
Debt issued	$ 800
Total commitments											700
Borrowing capacity		1,100	1,300	23	23	25	118	125	350	450		1,839	130
Principal amount of notes														250	250
Interest rate (as a percent)														4.00%	6.00%
Number of business days preceding the maturity date during which holders of convertible notes may convert all or any portion of the notes														3 days	3 days
Share Issuance, outstanding share percentage not approved to exceed														20.00%
Amount by which the if-converted value exceeded its principle amount															$ 255