Investments (Fixed Maturity and Equity Securities Available-For-Sale by Sector) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities [Abstract]
Amortized Cost	$ 339,287	$ 333,599
Cost or Amortized Cost	3,252	3,012
Gross Unrealized OTTI Loss	110	218	361
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	367,056	350,187
Equity securities	3,863	3,402
Fixed maturity securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	339,287	333,599
Gross Unrealized Gain	29,341	21,180
Gross Unrealized Temporary Loss	1,462	4,374
Gross Unrealized OTTI Loss	110	218
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	367,056	350,187
U.S. corporate securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	99,550	100,203
Gross Unrealized Gain	10,311	7,495
Gross Unrealized Temporary Loss	468	1,229
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	109,393	106,469
Foreign corporate securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	57,557	59,778
Gross Unrealized Gain	5,118	3,939
Gross Unrealized Temporary Loss	187	565
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	62,488	63,152
Foreign government debt securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	51,794	50,717
Gross Unrealized Gain	5,019	4,107
Gross Unrealized Temporary Loss	186	387
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	56,627	54,437
RMBS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	37,344	34,167
Gross Unrealized Gain	2,082	1,584
Gross Unrealized Temporary Loss	259	490
Gross Unrealized OTTI Loss	103	206
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	39,064	35,055
U.S. Treasury and agency securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	50,310	43,928
Gross Unrealized Gain	4,194	2,251
Gross Unrealized Temporary Loss	157	1,056
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	54,347	45,123
CMBS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	15,119	16,115
Gross Unrealized Gain	582	605
Gross Unrealized Temporary Loss	50	170
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	15,651	16,550
ABS [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	14,558	15,458
Gross Unrealized Gain	306	296
Gross Unrealized Temporary Loss	69	171
Gross Unrealized OTTI Loss	7	12
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	14,788	15,571
State and political subdivision securities [Member]
Available-for-sale Securities [Abstract]
Amortized Cost	13,055	13,233
Gross Unrealized Gain	1,729	903
Gross Unrealized Temporary Loss	86	306
Gross Unrealized OTTI Loss	0	0
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $339,287 and $333,599, respectively; includes $4,180 and $4,005, respectively, relating to variable interest entities)	14,698	13,830
Equity Securities [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	3,252	3,012
Gross Unrealized Gain	655	507
Gross Unrealized Temporary Loss	44	117
Gross Unrealized OTTI Loss	0	0
Equity securities	3,863	3,402
Common Stock [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	2,138	1,927
Gross Unrealized Gain	573	431
Gross Unrealized Temporary Loss	4	5
Gross Unrealized OTTI Loss	0	0
Equity securities	2,707	2,353
Non-redeemable preferred stock [Member]
Available-for-sale Securities [Abstract]
Cost or Amortized Cost	1,114	1,085
Gross Unrealized Gain	82	76
Gross Unrealized Temporary Loss	40	112
Gross Unrealized OTTI Loss	0	0
Equity securities	$ 1,156	$ 1,049