Investments (Fixed Maturity and Equity Securities Available-For-Sale by Sector) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities [Abstract]
Amortized Cost	$ 333,599	$ 340,870
Cost or Amortized Cost	3,012	2,838
Gross Unrealized OTTI Loss	218	361	724
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	350,187	374,266
Equity securities	3,402	2,891
Fixed maturity securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	333,599	340,870
Gross Unrealized Gain	21,180	35,144
Gross Unrealized Temporary Loss	4,374	1,387
Gross Unrealized OTTI Loss	218	361
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	350,187	374,266
U.S. corporate securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	100,203	102,669
Gross Unrealized Gain	7,495	11,887
Gross Unrealized Temporary Loss	1,229	430
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	106,469	114,126
Foreign corporate securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	59,778	61,806
Gross Unrealized Gain	3,939	5,654
Gross Unrealized Temporary Loss	565	277
Gross Unrealized OTTI Loss	0	(1)
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	63,152	67,184
Foreign government debt securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	50,717	51,967
Gross Unrealized Gain	4,107	5,440
Gross Unrealized Temporary Loss	387	71
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	54,437	57,336
RMBS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	34,167	35,666
Gross Unrealized Gain	1,584	2,477
Gross Unrealized Temporary Loss	490	315
Gross Unrealized OTTI Loss	206	349
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	35,055	37,479
U.S. Treasury and agency securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	43,928	41,874
Gross Unrealized Gain	2,251	6,104
Gross Unrealized Temporary Loss	1,056	11
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	45,123	47,967
CMBS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	16,115	18,177
Gross Unrealized Gain	605	1,009
Gross Unrealized Temporary Loss	170	57
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	16,550	19,129
ABS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	15,458	15,762
Gross Unrealized Gain	296	404
Gross Unrealized Temporary Loss	171	156
Gross Unrealized OTTI Loss	12	13
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	15,571	15,997
State and political subdivision securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	13,233	12,949
Gross Unrealized Gain	903	2,169
Gross Unrealized Temporary Loss	306	70
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $333,599 and $340,870, respectively; includes $4,005 and $3,378, respectively, relating to variable interest entities)	13,830	15,048
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	3,012	2,838
Gross Unrealized Gain	507	212
Gross Unrealized Temporary Loss	117	159
Gross Unrealized OTTI Loss	0	0
Equity securities	3,402	2,891
Common Stock [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	1,927	2,034
Gross Unrealized Gain	431	147
Gross Unrealized Temporary Loss	5	19
Gross Unrealized OTTI Loss	0	0
Equity securities	2,353	2,162
Non-redeemable preferred stock [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	1,085	804
Gross Unrealized Gain	76	65
Gross Unrealized Temporary Loss	112	140
Gross Unrealized OTTI Loss	0	0
Equity securities	$ 1,049	$ 729