Indemnity Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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 gains (losses)									$ 193	$ 771	$ 418
Net impairment losses recognized in earnings									(4)	(13)	0
Prior service cost									1	1
Net actuarial loss									6	15
Income (loss) from operations before income taxes and noncontrolling interest	377	150	147	156	470	398	263	436	830	1,567	899
Provision for income taxes									257	519	280
Net income (loss)	253	108	103	109	314	267	177	290	573	1,048	619
Less: Net income (loss) attributable to noncontrolling interest in consolidated entity – Exchange	227	61	54	63	278	221	133	253	405	885	459
Net income (loss) attributable to Indemnity	26	47	49	46	36	46	44	37	168	163	160
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 (loss) attributable to Indemnity									(4)	(9)
Unrealized holding gains (losses) on available-for-sale securities | 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 gains (losses)									32	3
Net impairment losses recognized in earnings									(4)	(13)
Income (loss) from operations before income taxes and noncontrolling interest									28	(10)
Provision for income taxes									10	(3)
Net income (loss)									18	(7)
Less: Net income (loss) attributable to noncontrolling interest in consolidated entity – Exchange									17	(8)
Net income (loss) attributable to Indemnity									1	1
Amortization of postretirement plan items | 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
Prior service cost									(1)	(1)
Net actuarial loss									(6)	(15)
Income (loss) from operations before income taxes and noncontrolling interest									(7)	(16)
Provision for income taxes									(2)	(6)
Net income (loss)									(5)	(10)
Less: Net income (loss) attributable to noncontrolling interest in consolidated entity – Exchange									0	0
Net income (loss) attributable to Indemnity									$ (5)	$ (10)