Fair Value of Financial Instruments (Balance Sheet by Levels) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fixed maturity AFS securities:
Corporate bonds	$ 68,016	$ 59,261
U.S. Government bonds	442	494
Foreign government bonds	654	733
RMBS	6,171	8,039
State and municipal bonds	4,353	4,047
Hybrid and redeemable preferred stocks	1,217	1,157
VIEs' fixed maturity securities	708	700
CMBS	1,003	1,600
CDOs	180	102
Equity AFS securities	157	139
Trading securities	2,554	2,675
Derivative Assets	2,652	3,151
Cash and invested cash	4,230	4,510
Separate account assets	95,373	83,477
Total assets	187,710	170,085
Future contract benefits:
Indexed annuity contracts	(732)	(399)
GLB embedded derivative reserves	(909)	(2,217)
Long-term debt	(1,203)	(1,688)
Reinsurance related embedded derivatives	(215)	(168)
Variable interest entities' liabilities - derivatives instruments	(128)	(291)
Other liabilities:
Credit default swaps	(11)	(16)
Total liabilities	(3,198)	(4,779)
Benefit Plans' Assets	1,456	1,345
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fixed maturity AFS securities:
Corporate bonds	65	63
U.S. Government bonds	411	475
Foreign government bonds	0	0
RMBS	0	0
State and municipal bonds	0	0
Hybrid and redeemable preferred stocks	30	15
VIEs' fixed maturity securities	110	108
CMBS	0	0
CDOs	0	0
Equity AFS securities	44	37
Trading securities	2	2
Derivative Assets	0	0
Cash and invested cash	0	0
Separate account assets	1,519	1,582
Total assets	2,181	2,282
Future contract benefits:
Indexed annuity contracts	0	0
GLB embedded derivative reserves	0	0
Long-term debt	0	0
Reinsurance related embedded derivatives	0	0
Variable interest entities' liabilities - derivatives instruments	0	0
Other liabilities:
Credit default swaps	0	0
Total liabilities	0	0
Benefit Plans' Assets	116	99
Significant Observable Inputs (Level 2) [Member]
Fixed maturity AFS securities:
Corporate bonds	66,446	57,310
U.S. Government bonds	30	18
Foreign government bonds	608	636
RMBS	6,168	7,881
State and municipal bonds	4,321	4,047
Hybrid and redeemable preferred stocks	1,069	1,042
VIEs' fixed maturity securities	598	592
CMBS	976	1,566
CDOs	26	0
Equity AFS securities	26	46
Trading securities	2,496	2,605
Derivative Assets	626	681
Cash and invested cash	4,230	4,510
Separate account assets	93,854	81,895
Total assets	181,474	162,829
Future contract benefits:
Indexed annuity contracts	0	0
GLB embedded derivative reserves	0	0
Long-term debt	(1,203)	(1,688)
Reinsurance related embedded derivatives	(215)	(168)
Variable interest entities' liabilities - derivatives instruments	0	0
Other liabilities:
Credit default swaps	0	0
Total liabilities	(1,418)	(1,856)
Benefit Plans' Assets	1,340	1,246
Significant Unobservable Inputs (Level 3) [Member]
Fixed maturity AFS securities:
Corporate bonds	1,505	1,888
U.S. Government bonds	1	1
Foreign government bonds	46	97
RMBS	3	158
State and municipal bonds	32	0
Hybrid and redeemable preferred stocks	118	100
VIEs' fixed maturity securities	0	0
CMBS	27	34
CDOs	154	102
Equity AFS securities	87	56
Trading securities	56	68
Derivative Assets	2,026	2,470
Cash and invested cash	0	0
Separate account assets	0	0
Total assets	4,055	4,974
Future contract benefits:
Indexed annuity contracts	(732)	(399)
GLB embedded derivative reserves	(909)	(2,217)
Long-term debt	0	0
Reinsurance related embedded derivatives	0	0
Variable interest entities' liabilities - derivatives instruments	(128)	(291)
Other liabilities:
Credit default swaps	(11)	(16)
Total liabilities	(1,780)	(2,923)
Benefit Plans' Assets	$ 0	$ 0