Schedule V. Valuation and Qualifying Accounts (Schedule of valuation and qualifying accounts) (Details) (Allowance for doubtful accounts, insurance and reinsurance receivables [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Allowance for doubtful accounts, insurance and reinsurance receivables [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period	$ 174		$ 203		$ 285
Charged to costs and expenses	(6)		(23)		(55)
Charged to other accounts	(3)	[1]	5	[1]		[1]
Deductions	(10)		(11)		(27)
Balance at end of period	$ 155		$ 174		$ 203

[1] Amount includes effects of foreign currency translation.