Guarantees and Contingent Liabilities (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014 employee claim	Dec. 31, 2013
Guarantees:
Limitations or indemnifications of reinsurance agreements	$ 0
Proceedings:
Number of class action cases	2
Number of cases pending	1
Number of former employee agents plaintiffs seek benefits for	6,500
Number of claims asserted in Romero II	3
Number of claims barred in Romero II	2
Reserves for asbestos claims	976	1,020
Reinsurance recoverables for asbestos claims	462	478
Reserves for environmental claims	201	208
Reinsurance recoverables for environmental claims	60	60
Percentage of net asbestos and environmental reserves that were for incurred but not reported estimated losses	53.00%	55.00%
Minimum
Proceedings:
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued	0
Maximum
Proceedings:
Loss contingencies, reasonably possible pretax loss exposure in excess of the amount accrued	825
Residual guarantee
Guarantees:
Potential leased automobiles residual value	34
Maximum amount at risk pursuant to a guarantee	$ 4
Guarantee obligations term, low end of range	1 year
Guarantee obligations term, high end of range	3 years