Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Policy loans	$ 11,762	$ 11,764
Liabilities
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,193
Separate account liabilities	316,434	317,201
Estimated Fair Value [Member]
Assets
Mortgage loans	58,104	57,924
Policy loans	13,335	13,206
Real estate joint ventures	180	169
Other Limited Partnership Interests	1,125	1,109
Other invested assets	714	844
Premiums, reinsurance and other receivables	4,066	3,110
Other assets	292	352
Liabilities
Policyholder account balances	140,688	144,631
Long-term Debt	17,610	18,564
Collateral financing arrangements	3,993	3,984
Junior subordinated debt securities	3,890	3,789
Other Liabilities	4,855	2,240
Separate account liabilities	115,260	117,562
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Mortgage loans	0	0
Policy loans	0	0
Real estate joint ventures	0	0
Other Limited Partnership Interests	0	0
Other invested assets	233	322
Premiums, reinsurance and other receivables	0	0
Other assets	0	0
Liabilities
Policyholder account balances	0	0
Long-term Debt	0	0
Collateral financing arrangements	0	0
Junior subordinated debt securities	0	0
Other Liabilities	0	0
Separate account liabilities	0	0
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Mortgage loans	0	0
Policy loans	1,688	1,694
Real estate joint ventures	0	0
Other Limited Partnership Interests	0	0
Other invested assets	150	163
Premiums, reinsurance and other receivables	1,622	728
Other assets	212	210
Liabilities
Policyholder account balances	0	0
Long-term Debt	17,610	18,564
Collateral financing arrangements	0	0
Junior subordinated debt securities	3,890	3,789
Other Liabilities	3,545	948
Separate account liabilities	115,260	117,562
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Mortgage loans	58,104	57,924
Policy loans	11,647	11,512
Real estate joint ventures	180	169
Other Limited Partnership Interests	1,125	1,109
Other invested assets	331	359
Premiums, reinsurance and other receivables	2,444	2,382
Other assets	80	142
Liabilities
Policyholder account balances	140,688	144,631
Long-term Debt	0	0
Collateral financing arrangements	3,993	3,984
Junior subordinated debt securities	0	0
Other Liabilities	1,310	1,292
Separate account liabilities	0	0
Carrying Value [Member]
Assets
Mortgage loans	55,647	55,770
Policy loans	11,762	11,764
Real estate joint ventures	101	102
Other Limited Partnership Interests	908	950
Other invested assets	714	844
Premiums, reinsurance and other receivables	4,018	3,116
Other assets	262	324
Liabilities
Policyholder account balances	135,189	139,735
Long-term Debt	15,766	17,170
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,193
Other Liabilities	4,853	2,239
Separate account liabilities	$ 115,260	$ 117,562