Indemnity Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Other comprehensive (loss) income	$ (63)	$ (2)	$ 74	$ (221)	$ (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			4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive (loss) income			3		74
Balance, end of period	(56)		(56)		(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			4
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			(1)
Other comprehensive (loss) income			3
Balance, end of period	9		9
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 (loss) income			0
Balance, end of period	$ (65)		$ (65)