Investments (Continuous Gross Unrealized Losses for Fixed Maturity and Equity Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
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	2,644	4,480
Total number of securities in an unrealized loss position equal to or greater than 12 months	1,667	1,571
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	$ 41,773	$ 64,516
Less than 12 Months Gross Unrealized Loss	689	3,372
Equal to or Greater than 12 Months Estimated Fair Value	16,860	12,592
Equal to or Greater than 12 Months Gross Unrealized Loss	1,035	1,220
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	11,929	13,889
Less than 12 Months Gross Unrealized Loss	212	808
Equal to or Greater than 12 Months Estimated Fair Value	5,070	3,807
Equal to or Greater than 12 Months Gross Unrealized Loss	336	421
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	7,043	9,019
Less than 12 Months Gross Unrealized Loss	251	402
Equal to or Greater than 12 Months Estimated Fair Value	2,275	2,320
Equal to or Greater than 12 Months Gross Unrealized Loss	148	163
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	1,707	5,052
Less than 12 Months Gross Unrealized Loss	66	336
Equal to or Greater than 12 Months Estimated Fair Value	1,478	1,846
Equal to or Greater than 12 Months Gross Unrealized Loss	124	51
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	5,543	10,754
Less than 12 Months Gross Unrealized Loss	79	363
Equal to or Greater than 12 Months Estimated Fair Value	3,669	2,302
Equal to or Greater than 12 Months Gross Unrealized Loss	263	333
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	9,654	15,225
Less than 12 Months Gross Unrealized Loss	25	1,037
Equal to or Greater than 12 Months Estimated Fair Value	2,025	357
Equal to or Greater than 12 Months Gross Unrealized Loss	48	19
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	1,579	3,696
Less than 12 Months Gross Unrealized Loss	26	142
Equal to or Greater than 12 Months Estimated Fair Value	864	631
Equal to or Greater than 12 Months Gross Unrealized Loss	31	28
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	4,159	3,772
Less than 12 Months Gross Unrealized Loss	28	59
Equal to or Greater than 12 Months Estimated Fair Value	801	978
Equal to or Greater than 12 Months Gross Unrealized Loss	40	124
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	159	3,109
Less than 12 Months Gross Unrealized Loss	2	225
Equal to or Greater than 12 Months Estimated Fair Value	678	351
Equal to or Greater than 12 Months Gross Unrealized Loss	45	81
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	285	445
Less than 12 Months Gross Unrealized Loss	5	69
Equal to or Greater than 12 Months Estimated Fair Value	246	207
Equal to or Greater than 12 Months Gross Unrealized Loss	35	48
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	97	81
Less than 12 Months Gross Unrealized Loss	3	4
Equal to or Greater than 12 Months Estimated Fair Value	2	16
Equal to or Greater than 12 Months Gross Unrealized Loss	0	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	188	364
Less than 12 Months Gross Unrealized Loss	2	65
Equal to or Greater than 12 Months Estimated Fair Value	244	191
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 35	$ 47