Guarantees and Contingent Liabilities (Details) $ in Millions		9 Months Ended
	Jun. 17, 2015 Plaintiff	Sep. 30, 2015 USD ($) claim	Sep. 30, 2015 USD ($) claim	Sep. 30, 2015 USD ($) employee claim	Sep. 30, 2015 USD ($) claim	Sep. 30, 2015 USD ($) claim Plaintiff	Dec. 31, 2014 USD ($)
Guarantees:
Limitations or indemnifications of reinsurance agreements		$ 0	$ 0	$ 0	$ 0	$ 0
Proceedings:
Number of class action cases | claim					2
Number of cases pending | claim		1	1	1	1	1
Number of former employee agents plaintiffs seek benefits for | employee				6,300
Loss Contingency, Number of Plaintiffs	10			32		459
Reserves for asbestos claims		$ 995	$ 995	$ 995	$ 995	$ 995	$ 1,010
Reinsurance recoverables for asbestos claims		475	475	475	475	475	478
Reserves for environmental claims		188	188	188	188	188	203
Reinsurance recoverables for environmental claims		$ 45	$ 45	$ 45	$ 45	$ 45	$ 64
Percentage of net asbestos and environmental reserves that were for incurred but not reported estimated losses		57.00%	57.00%	57.00%	57.00%	57.00%	57.00%
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			875
Residual guarantee
Guarantees:
Potential leased automobiles residual value		$ 49	49	$ 49	$ 49	$ 49
Guarantee obligations term, low end of range		1 year
Guarantee obligations term, high end of range		3 years
Maximum amount at risk pursuant to a guarantee		$ 4	$ 4	$ 4	$ 4	$ 4
Signed Releases Knowingly and Voluntarily [Member] | Judicial Ruling [Member]
Proceedings:
Loss Contingency, Number of Plaintiffs | Plaintiff	2
Did Not Sign Releases Knowingly and Voluntarily [Member] | Judicial Ruling [Member]
Proceedings:
Loss Contingency, Number of Plaintiffs | Plaintiff	8