Fair Value (Financial Instruments Carried at Other Than Fair Value) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	$ 55,343	$ 56,592
Held-for-sale	2	49
Policy loans	11,781	11,884
Other Limited Partnership Interests	7,087	6,688
Other Investments	20,269	21,145
Liabilities
Policyholder account balances	224,044	225,821
Bank deposits	0	6,416
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,192
Other Liabilities	24,260	22,492
Separate account liabilities	249,220	235,393
Mortgage Loan Commitments [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	3,100	3,000
Commitments to Extend Credit [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	906	1,200
Estimate of Fair Value, Fair Value Disclosure [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	56,652	57,381
Held-for-sale	269	365
Mortgage loans, net	56,921	57,746
Policy loans	14,066	14,257
Real estate joint ventures	169	171
Other Limited Partnership Interests	1,265	1,277
Other Investments	882	815
Premiums, reinsurance and other receivables	3,164	3,705
Other assets	291	292
Liabilities
Policyholder account balances	157,571	158,040
Bank deposits	0	6,416
Long-term Debt	18,603	18,978
Collateral financing arrangements	3,879	3,839
Junior subordinated debt securities	4,066	3,984
Other Liabilities	4,550	1,916
Separate account liabilities	60,219	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	16	12
Estimate of Fair Value, Fair Value Disclosure [Member] | Commitments to Extend Credit [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	26	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	232	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 Extend Credit [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	1,690	1,690
Real estate joint ventures	0	0
Other Limited Partnership Interests	0	0
Other Investments	301	144
Premiums, reinsurance and other receivables	408	745
Other assets	214	214
Liabilities
Policyholder account balances	0	0
Bank deposits	0	2,018
Long-term Debt	18,603	18,978
Collateral financing arrangements	0	0
Junior subordinated debt securities	4,066	3,984
Other Liabilities	3,303	673
Separate account liabilities	60,219	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 Extend Credit [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	26	22
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member]
Mortgage loans [Abstract]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	56,652	57,381
Held-for-sale	269	365
Mortgage loans, net	56,921	57,746
Policy loans	12,376	12,567
Real estate joint ventures	169	171
Other Limited Partnership Interests	1,265	1,277
Other Investments	349	366
Premiums, reinsurance and other receivables	2,756	2,960
Other assets	77	78
Liabilities
Policyholder account balances	157,571	158,040
Bank deposits	0	4,398
Long-term Debt	0	0
Collateral financing arrangements	3,879	3,839
Junior subordinated debt securities	0	0
Other Liabilities	1,247	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	16	12
Estimate of Fair Value, Fair Value Disclosure [Member] | Level 3 [Member] | Commitments to Extend Credit [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	52,936	53,926
Held-for-sale	269	365
Mortgage loans, net	53,205	54,291
Policy loans	11,781	11,884
Real estate joint ventures	108	113
Other Limited Partnership Interests	1,132	1,154
Other Investments	882	815
Premiums, reinsurance and other receivables	2,894	3,287
Other assets	259	260
Liabilities
Policyholder account balances	149,851	149,928
Bank deposits	0	6,416
Long-term Debt	16,422	16,502
Collateral financing arrangements	4,196	4,196
Junior subordinated debt securities	3,193	3,192
Other Liabilities	4,547	1,913
Separate account liabilities	60,219	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 Extend Credit [Member]
Commitments [Abstract]
Commitments to fund bank credit facilities, bridge loans and private corporate bond investments	$ 0	$ 0