Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	$ 55,636	$ 56,592
Held-for-sale	0	49
Policy loans	11,722	11,884
Other Limited Partnership Interests	7,197	6,688
Other Investments	17,920	21,145
Liabilities
Policyholder account balances	215,195	225,821
Bank deposits	0	6,416
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,192
Other Liabilities	25,331	22,492
Separate account liabilities	245,573	235,393
Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	3,900	3,000
Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	1,000	1,200
Estimate of Fair Value, Fair Value Disclosure [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	55,875	57,381
Held-for-sale	0	365
Mortgage loans, net	55,875	57,746
Policy loans	13,608	14,257
Real estate joint ventures	174	171
Other Limited Partnership Interests	1,246	1,277
Other Investments	892	815
Premiums, reinsurance and other receivables	2,947	3,705
Other assets	289	292
Liabilities
Policyholder account balances	149,632	158,040
Bank deposits	0	6,416
Long-term Debt	18,021	18,978
Collateral financing arrangements	3,937	3,839
Junior subordinated debt securities	3,874	3,984
Other Liabilities	5,784	1,916
Separate account liabilities	61,122	58,726
Estimate of Fair Value, Fair Value Disclosure [Member] | Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	(34)	12
Estimate of Fair Value, Fair Value Disclosure [Member] | Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	(21)	22
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	0	0
Held-for-sale	0	0
Mortgage loans, net	0	0
Policy loans	0	0
Real estate joint ventures	0	0
Other Limited Partnership Interests	0	0
Other Investments	250	305
Premiums, reinsurance and other receivables	0	0
Other assets	0	0
Liabilities
Policyholder account balances	0	0
Bank deposits	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
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 1 [Member] | Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	0	0
Held-for-sale	0	0
Mortgage loans, net	0	0
Policy loans	1,646	1,690
Real estate joint ventures	0	0
Other Limited Partnership Interests	0	0
Other Investments	314	144
Premiums, reinsurance and other receivables	404	745
Other assets	211	214
Liabilities
Policyholder account balances	0	0
Bank deposits	0	2,018
Long-term Debt	18,021	18,978
Collateral financing arrangements	0	0
Junior subordinated debt securities	3,874	3,984
Other Liabilities	4,532	673
Separate account liabilities	61,122	58,726
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 2 [Member] | Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	(21)	22
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	55,875	57,381
Held-for-sale	0	365
Mortgage loans, net	55,875	57,746
Policy loans	11,962	12,567
Real estate joint ventures	174	171
Other Limited Partnership Interests	1,246	1,277
Other Investments	328	366
Premiums, reinsurance and other receivables	2,543	2,960
Other assets	78	78
Liabilities
Policyholder account balances	149,632	158,040
Bank deposits	0	4,398
Long-term Debt	0	0
Collateral financing arrangements	3,937	3,839
Junior subordinated debt securities	0	0
Other Liabilities	1,252	1,243
Separate account liabilities	0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	(34)	12
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	0	0
Carrying Value [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	53,218	53,926
Held-for-sale	0	365
Mortgage loans, net	53,218	54,291
Policy loans	11,722	11,884
Real estate joint ventures	106	113
Other Limited Partnership Interests	1,064	1,154
Other Investments	892	815
Premiums, reinsurance and other receivables	2,799	3,287
Other assets	260	260
Liabilities
Policyholder account balances	142,852	149,928
Bank deposits	0	6,416
Long-term Debt	16,421	16,502
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,192
Other Liabilities	5,781	1,913
Separate account liabilities	61,122	58,726
Carrying Value [Member] | Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	0	0
Carrying Value [Member] | Commitments to Fund Bank Credit Facilities, Bridge Loans and Private Corporate Bond Investments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	$ 0	$ 0