Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses Level 4 Life 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
Reinsurance Recoverables	$ 22,920	$ 23,330
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)	228	192	(4)
Group Insurance Policies [Member]
Liability for Claims and Claims Adjustment Expense	6,084	6,308	6,547	6,547
Reinsurance Recoverables	271	267	252	233
Beginning liabilities for unpaid losses and loss adjustment expenses, net	5,813	6,041	6,295	6,314
Current Year Claims and Claims Adjustment Expense	2,370	2,534	2,989
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease)	11	17	(52)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	2,359	2,517	3,041
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	1,161	1,207	1,460
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	1,426	1,564	1,600
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 2,587	$ 2,771	$ 3,060