Investments (Continuous Gross Unrealized Losses for Fixed Maturity and Equity Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Total number of securities in an unrealized loss position less than 12 months	4,480	1,941
Total number of securities in an unrealized loss position equal to or greater than 12 months	1,571	1,335
Fixed maturity securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	$ 64,516	$ 13,721
Less than 12 Months Gross Unrealized Loss	3,372	293
Equal to or Greater than 12 Months Estimated Fair Value	12,592	13,447
Equal to or Greater than 12 Months Gross Unrealized Loss	1,220	1,455
U.S. corporate securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	13,889	3,799
Less than 12 Months Gross Unrealized Loss	808	88
Equal to or Greater than 12 Months Estimated Fair Value	3,807	3,695
Equal to or Greater than 12 Months Gross Unrealized Loss	421	342
Foreign corporate securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	9,019	2,783
Less than 12 Months Gross Unrealized Loss	402	96
Equal to or Greater than 12 Months Estimated Fair Value	2,320	2,873
Equal to or Greater than 12 Months Gross Unrealized Loss	163	180
Foreign government debt securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	5,052	1,431
Less than 12 Months Gross Unrealized Loss	336	22
Equal to or Greater than 12 Months Estimated Fair Value	1,846	543
Equal to or Greater than 12 Months Gross Unrealized Loss	51	49
RMBS [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	10,754	735
Less than 12 Months Gross Unrealized Loss	363	31
Equal to or Greater than 12 Months Estimated Fair Value	2,302	4,098
Equal to or Greater than 12 Months Gross Unrealized Loss	333	633
U.S. Treasury, agency and government guaranteed securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	15,225	1,951
Less than 12 Months Gross Unrealized Loss	1,037	11
Equal to or Greater than 12 Months Estimated Fair Value	357	0
Equal to or Greater than 12 Months Gross Unrealized Loss	19	0
CMBS [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	3,696	842
Less than 12 Months Gross Unrealized Loss	142	11
Equal to or Greater than 12 Months Estimated Fair Value	631	577
Equal to or Greater than 12 Months Gross Unrealized Loss	28	46
ABS [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	3,772	1,920
Less than 12 Months Gross Unrealized Loss	59	30
Equal to or Greater than 12 Months Estimated Fair Value	978	1,410
Equal to or Greater than 12 Months Gross Unrealized Loss	124	139
State and political subdivision securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	3,109	260
Less than 12 Months Gross Unrealized Loss	225	4
Equal to or Greater than 12 Months Estimated Fair Value	351	251
Equal to or Greater than 12 Months Gross Unrealized Loss	81	66
Equity Securities [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	445	201
Less than 12 Months Gross Unrealized Loss	69	18
Equal to or Greater than 12 Months Estimated Fair Value	207	309
Equal to or Greater than 12 Months Gross Unrealized Loss	48	141
Common Stock [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	81	201
Less than 12 Months Gross Unrealized Loss	4	18
Equal to or Greater than 12 Months Estimated Fair Value	16	14
Equal to or Greater than 12 Months Gross Unrealized Loss	1	1
Non-redeemable preferred stock [Member]
Continuous Gross Unrealized Loss and OTTI Loss for Fixed Maturity and Equity Securities Available-for-Sale
Less than 12 months Estimated Fair Value	364	0
Less than 12 Months Gross Unrealized Loss	65	0
Equal to or Greater than 12 Months Estimated Fair Value	191	295
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 47	$ 140