Indemnity Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Other comprehensive (loss) income	$ (140)	$ 65	$ (90)	$ 137	$ 0
Indemnity
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Balance, beginning of period			(118)	(59)	(59)
Other comprehensive income (loss) before reclassifications, net of tax			(2)		(63)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0		4
Other comprehensive (loss) income			(2)		(59)
Balance, end of period	(120)		(120)		(118)
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			7	6	6
Other comprehensive income (loss) before reclassifications, net of tax			(2)		2
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0		(1)
Other comprehensive (loss) income			(2)		1
Balance, end of period	5		5		7
Indemnity | Postretirement plans
Changes in Indemnity's accumulated other comprehensive income (loss) by component attributable to the Indemnity shareholder interest
Balance, beginning of period			(125)	$ (65)	(65)
Other comprehensive income (loss) before reclassifications, net of tax			0		(65)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax			0		5
Other comprehensive (loss) income			0		(60)
Balance, end of period	$ (125)		$ (125)		$ (125)