Fair Value (Recurring Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets [Abstract]
Available-for-sale Securities, Debt Securities	$ 45,930	$ 50,968
Available-for-sale Securities, Equity Securities	397	317
FVO securities	9	9
Short-term investments	2,298	2,576
Mortgage Loans on Real Estate	8,549	9,157
Derivative assets	1,600	2,370
Net embedded derivatives within asset host contracts	1,766	3,537
Separate account assets	94,020	86,114
Liabilities [Abstract]
Derivative liabilities	811	970
Net embedded derivatives within liability host contracts	(606)	1,261
Long-term Debt	2,759	3,350
Consolidated Securitization Entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate	2,096	2,666
Liabilities [Abstract]
Long-term Debt	1,969	2,559
Recurring [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	45,930	50,968
Available-for-sale Securities, Equity Securities	397	317
FVO securities	9	9
Short-term investments	2,102	2,531
Derivative assets	1,600	2,370
Net embedded derivatives within asset host contracts	1,797	3,551
Separate account assets	94,020	86,114
Total assets	147,951	148,526
Liabilities [Abstract]
Derivative liabilities	811	970
Net embedded derivatives within liability host contracts	(606)	1,261
Total liabilities	2,174	4,790
Recurring [Member] | Consolidated Securitization Entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate	2,096	2,666
Liabilities [Abstract]
Long-term Debt	1,969	2,559
Recurring [Member] | Interest rate contracts [Member]
Assets [Abstract]
Derivative assets	1,133	1,791
Liabilities [Abstract]
Derivative liabilities	590	803
Recurring [Member] | Foreign currency exchange rate contracts [Member]
Assets [Abstract]
Derivative assets	72	76
Liabilities [Abstract]
Derivative liabilities	88	67
Recurring [Member] | Credit contracts [Member]
Assets [Abstract]
Derivative assets	29	23
Liabilities [Abstract]
Derivative liabilities	2	3
Recurring [Member] | Equity market contracts [Member]
Assets [Abstract]
Derivative assets	366	480
Liabilities [Abstract]
Derivative liabilities	131	97
Recurring [Member] | U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	17,448	18,895
Recurring [Member] | U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	7,756	8,864
Recurring [Member] | Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	8,795	9,445
Recurring [Member] | RMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	5,104	5,738
Recurring [Member] | ABS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,948	2,253
Recurring [Member] | State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	2,122	2,329
Recurring [Member] | CMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,663	2,356
Recurring [Member] | Foreign Government Debt Securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,094	1,088
Recurring [Member] | Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	208	140
Recurring [Member] | Common Stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	189	177
Recurring [Member] | Level 1 [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	3,944	5,082
Available-for-sale Securities, Equity Securities	77	70
FVO securities	0	0
Short-term investments	289	1,233
Derivative assets	6	0
Net embedded derivatives within asset host contracts	0	0
Separate account assets	218	201
Total assets	4,534	6,586
Liabilities [Abstract]
Derivative liabilities	0	34
Net embedded derivatives within liability host contracts	0	0
Total liabilities	0	34
Recurring [Member] | Level 1 [Member] | Consolidated Securitization Entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate	0	0
Liabilities [Abstract]
Long-term Debt	0	0
Recurring [Member] | Level 1 [Member] | Interest rate contracts [Member]
Assets [Abstract]
Derivative assets	1	0
Liabilities [Abstract]
Derivative liabilities	0	7
Recurring [Member] | Level 1 [Member] | Foreign currency exchange rate contracts [Member]
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | Credit contracts [Member]
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring [Member] | Level 1 [Member] | Equity market contracts [Member]
Assets [Abstract]
Derivative assets	5	0
Liabilities [Abstract]
Derivative liabilities	0	27
Recurring [Member] | Level 1 [Member] | U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	3,836	5,082
Recurring [Member] | Level 1 [Member] | Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | RMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	108	0
Recurring [Member] | Level 1 [Member] | ABS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | CMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | Foreign Government Debt Securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 1 [Member] | Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	0	0
Recurring [Member] | Level 1 [Member] | Common Stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	77	70
Recurring [Member] | Level 2 [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	39,269	42,810
Available-for-sale Securities, Equity Securities	215	128
FVO securities	9	9
Short-term investments	1,811	1,285
Derivative assets	1,527	2,201
Net embedded derivatives within asset host contracts	0	0
Separate account assets	93,662	85,772
Total assets	138,589	134,871
Liabilities [Abstract]
Derivative liabilities	694	845
Net embedded derivatives within liability host contracts	0	0
Total liabilities	2,663	3,404
Recurring [Member] | Level 2 [Member] | Consolidated Securitization Entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate	2,096	2,666
Liabilities [Abstract]
Long-term Debt	1,969	2,559
Recurring [Member] | Level 2 [Member] | Interest rate contracts [Member]
Assets [Abstract]
Derivative assets	1,077	1,643
Liabilities [Abstract]
Derivative liabilities	570	767
Recurring [Member] | Level 2 [Member] | Foreign currency exchange rate contracts [Member]
Assets [Abstract]
Derivative assets	72	76
Liabilities [Abstract]
Derivative liabilities	88	67
Recurring [Member] | Level 2 [Member] | Credit contracts [Member]
Assets [Abstract]
Derivative assets	22	13
Liabilities [Abstract]
Derivative liabilities	2	3
Recurring [Member] | Level 2 [Member] | Equity market contracts [Member]
Assets [Abstract]
Derivative assets	356	469
Liabilities [Abstract]
Derivative liabilities	34	8
Recurring [Member] | Level 2 [Member] | U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	16,367	17,461
Recurring [Member] | Level 2 [Member] | U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	3,920	3,782
Recurring [Member] | Level 2 [Member] | Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	8,033	8,577
Recurring [Member] | Level 2 [Member] | RMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	4,603	5,460
Recurring [Member] | Level 2 [Member] | ABS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,538	1,910
Recurring [Member] | Level 2 [Member] | State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	2,117	2,304
Recurring [Member] | Level 2 [Member] | CMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,597	2,231
Recurring [Member] | Level 2 [Member] | Foreign Government Debt Securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,094	1,085
Recurring [Member] | Level 2 [Member] | Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	131	47
Recurring [Member] | Level 2 [Member] | Common Stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	84	81
Recurring [Member] | Level 3 [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	2,717	3,076
Available-for-sale Securities, Equity Securities	105	119
FVO securities	0	0
Short-term investments	2	13
Derivative assets	67	169
Net embedded derivatives within asset host contracts	1,797	3,551
Separate account assets	140	141
Total assets	4,828	7,069
Liabilities [Abstract]
Derivative liabilities	117	91
Net embedded derivatives within liability host contracts	(606)	1,261
Total liabilities	(489)	1,352
Recurring [Member] | Level 3 [Member] | Consolidated Securitization Entities [Member]
Assets [Abstract]
Mortgage Loans on Real Estate	0	0
Liabilities [Abstract]
Long-term Debt	0	0
Recurring [Member] | Level 3 [Member] | Interest rate contracts [Member]
Assets [Abstract]
Derivative assets	55	148
Liabilities [Abstract]
Derivative liabilities	20	29
Recurring [Member] | Level 3 [Member] | Foreign currency exchange rate contracts [Member]
Assets [Abstract]
Derivative assets	0	0
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring [Member] | Level 3 [Member] | Credit contracts [Member]
Assets [Abstract]
Derivative assets	7	10
Liabilities [Abstract]
Derivative liabilities	0	0
Recurring [Member] | Level 3 [Member] | Equity market contracts [Member]
Assets [Abstract]
Derivative assets	5	11
Liabilities [Abstract]
Derivative liabilities	97	62
Recurring [Member] | Level 3 [Member] | U.S. corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	1,081	1,434
Recurring [Member] | Level 3 [Member] | U.S. Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	0
Recurring [Member] | Level 3 [Member] | Foreign corporate securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	762	868
Recurring [Member] | Level 3 [Member] | RMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	393	278
Recurring [Member] | Level 3 [Member] | ABS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	410	343
Recurring [Member] | Level 3 [Member] | State and political subdivision securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	5	25
Recurring [Member] | Level 3 [Member] | CMBS [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	66	125
Recurring [Member] | Level 3 [Member] | Foreign Government Debt Securities [Member]
Assets [Abstract]
Available-for-sale Securities, Debt Securities	0	3
Recurring [Member] | Level 3 [Member] | Non-redeemable preferred stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	77	93
Recurring [Member] | Level 3 [Member] | Common Stock [Member]
Assets [Abstract]
Available-for-sale Securities, Equity Securities	$ 28	$ 26