Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses Level 4 P&C Liabilities for Unpaid Losses and Loss Adjustment Expenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Less payment
Prior years	$ (228)		$ (192)		$ 4
Reinsurance recoverables, Ending Balance	22,920		23,330
Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses (Textual) [Abstract]
Current accident year benefit from discounting property and casualty reserves	34		46		48
Accretion of discounts for prior accident years	31		31		52
Annuity Obligations	776		805
Property, Liability and Casualty Insurance Product Line [Member]
Product Information [Line Items]
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments	3,041		3,028		3,027		3,033
Reserve Development
Beginning liabilities for unpaid losses and loss adjustment expenses, gross	21,704		21,716		21,550
Beginning liabilities for unpaid losses and loss adjustment expenses, net	18,765		18,676		18,689		18,517
Add provision for unpaid losses and loss adjustment expenses
Current Year Claims and Claims Adjustment Expense	6,572		6,621		7,274
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	6,800		6,813		7,270
Less payment
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	2,639		2,552		2,882
Prior years	(228)		(192)		4
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	4,072		4,274		4,216
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	6,711		6,826		7,098
Ending liabilities for unpaid losses and loss adjustment expenses, net	18,765		18,676		18,689		18,517
Reinsurance recoverables, Ending Balance	2,730		2,735
Ending liabilities for unpaid losses and loss adjustment expenses, gross	21,806		21,704		21,716
Property, Liability and Casualty Insurance Product Line [Member]
Product Information [Line Items]
Supplemental Information for Property, Casualty Insurance Underwriters, Discount Deducted from Reserves	$ 556	[1]	$ 553	[1]	$ 538	[1]

[1] Reserves for permanently disabled claimants have been discounted using the weighted average interest rates of 3.5%, 3.5%, and 4.0% for the years ended December 31, 2014, 2013, and 2012, respectively.