Indemnity Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
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	$ 56	$ 249
Net impairment losses recognized in earnings	0	0
Income (loss) from operations before income taxes and noncontrolling interest	156	436
Provision for income taxes	47	146
Net income (loss)	109	290	1,048
Less: Net income attributable to noncontrolling interest in consolidated entity – Exchange	63	253
Net income attributable to Indemnity	46	37
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	1
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	13
Net impairment losses recognized in earnings	0
Income (loss) from operations before income taxes and noncontrolling interest	13
Provision for income taxes	5
Net income (loss)	8
Less: Net income attributable to noncontrolling interest in consolidated entity – Exchange	7
Net income attributable to Indemnity	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
Net income attributable to Indemnity	$ 0