Investments (Continuous Gross Unrealized Losses for Fixed Maturity and Equity Securities Available-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 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	1,611	4,480
Total number of securities in an unrealized loss position equal to or greater than 12 months	1,853	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	$ 19,413	$ 64,516
Less than 12 Months Gross Unrealized Loss	305	3,372
Equal to or Greater than 12 Months Estimated Fair Value	24,690	12,592
Equal to or Greater than 12 Months Gross Unrealized Loss	1,267	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	4,041	13,889
Less than 12 Months Gross Unrealized Loss	59	808
Equal to or Greater than 12 Months Estimated Fair Value	7,002	3,807
Equal to or Greater than 12 Months Gross Unrealized Loss	409	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	2,781	9,019
Less than 12 Months Gross Unrealized Loss	70	402
Equal to or Greater than 12 Months Estimated Fair Value	2,822	2,320
Equal to or Greater than 12 Months Gross Unrealized Loss	117	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	2,226	5,052
Less than 12 Months Gross Unrealized Loss	54	336
Equal to or Greater than 12 Months Estimated Fair Value	1,955	1,846
Equal to or Greater than 12 Months Gross Unrealized Loss	132	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	1,640	10,754
Less than 12 Months Gross Unrealized Loss	77	363
Equal to or Greater than 12 Months Estimated Fair Value	4,162	2,302
Equal to or Greater than 12 Months Gross Unrealized Loss	285	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	4,865	15,225
Less than 12 Months Gross Unrealized Loss	6	1,037
Equal to or Greater than 12 Months Estimated Fair Value	5,673	357
Equal to or Greater than 12 Months Gross Unrealized Loss	151	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	860	3,696
Less than 12 Months Gross Unrealized Loss	20	142
Equal to or Greater than 12 Months Estimated Fair Value	1,076	631
Equal to or Greater than 12 Months Gross Unrealized Loss	30	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	2,845	3,772
Less than 12 Months Gross Unrealized Loss	17	59
Equal to or Greater than 12 Months Estimated Fair Value	786	978
Equal to or Greater than 12 Months Gross Unrealized Loss	59	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	155	3,109
Less than 12 Months Gross Unrealized Loss	2	225
Equal to or Greater than 12 Months Estimated Fair Value	1,214	351
Equal to or Greater than 12 Months Gross Unrealized Loss	84	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	158	445
Less than 12 Months Gross Unrealized Loss	6	69
Equal to or Greater than 12 Months Estimated Fair Value	348	207
Equal to or Greater than 12 Months Gross Unrealized Loss	38	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	90	81
Less than 12 Months Gross Unrealized Loss	4	4
Equal to or Greater than 12 Months Estimated Fair Value	0	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	68	364
Less than 12 Months Gross Unrealized Loss	2	65
Equal to or Greater than 12 Months Estimated Fair Value	348	191
Equal to or Greater than 12 Months Gross Unrealized Loss	$ 38	$ 47