Indemnity Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented
Net realized investment (losses) gains	$ (292)	$ (85)	$ (243)	$ 104
Net impairment losses recognized in earnings	(4)	(1)	(8)	(1)
Income (loss) from operations before income taxes and noncontrolling interest	40	150	532	453
Provision for income taxes	7	42	166	133
Net income (loss)	33	108	366	320	$ 573
Less: Net (loss) income attributable to noncontrolling interest in consolidated entity – Exchange	(17)	61	221	178
Net income attributable to Indemnity	50	47	145	142
Unrealized holding gains (losses) on available-for-sale securities including portion attributable to Exchange noncontrolling interest | Amounts reclassified from accumulated other comprehensive income (loss)
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented
Net realized investment (losses) gains	2	6	17	24
Net impairment losses recognized in earnings	(4)	(1)	(8)	(1)
Income (loss) from operations before income taxes and noncontrolling interest	(2)	5	9	23
Provision for income taxes	(1)	1	3	8
Net income (loss)	(1)	4	6	15
Unrealized holding gains (losses) on available-for-sale securities attributable to Exchange noncontrolling interest | Amounts reclassified from accumulated other comprehensive income (loss)
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented
Less: Net (loss) income attributable to noncontrolling interest in consolidated entity – Exchange	(1)	4	6	14
Unrealized holding gains (losses) on available-for-sale securities attributable to Indemnity shareholder interest | Amounts reclassified from accumulated other comprehensive income (loss)
Amounts reclassified out of accumulated other comprehensive income (loss) and the related affected line item in the Consolidated Statements of Operations where net income is presented
Net income attributable to Indemnity	$ 0	$ 0	$ 0	$ 1