Indemnity Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Other comprehensive income (loss)	$ 65	$ (197)	$ 137	$ (219)	$ (144)
Indemnity
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Balance, beginning of period			(59)
Other comprehensive income before reclassifications, net of tax			5
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive income (loss)			4		74
Balance, end of period	(55)		(55)		(59)
Indemnity | Unrealized holding gains (losses) on available-for-sale securities
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Balance, beginning of period			6
Other comprehensive income before reclassifications, net of tax			5
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive income (loss)			4
Balance, end of period	10		10
Indemnity | Postretirement plans
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Balance, beginning of period			(65)
Other comprehensive income before reclassifications, net of tax			0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0
Other comprehensive income (loss)			0
Balance, end of period	$ (65)		$ (65)