Investments (Fixed Maturities and Equity Securities Excluding Investments Classified as Trading) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		$ 262,820	$ 265,116
Amortized Cost		6,870	6,921
Fair Value	[1]	290,063	299,090
Fair Value		9,901	9,861
Amortized Cost	[1]	2,396	2,575
Fair Value		2,674	2,902
Net unrealized gains on impaired available for sale securities relating to changes in value of securities subsequent to the impairment measurement date		944	954
Net unrealized gains on impaired held to maturity securities (less than)		1	1
Prudential Netting Agreement
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		3,850	3,588
Fair Value		4,069	3,953
Fixed maturities, available-for-sale
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		262,820	265,116
Gross Unrealized Gains		30,260	35,329
Gross Unrealized Losses		3,017	1,355
Fair Value		290,063	299,090
Other-than-temporary Impairments in AOCI		(589)	(605)
Amortized Cost		2,396	2,575
Gross Unrealized Gains		280	328
Gross Unrealized Losses		2	1
Fair Value		2,674	2,902
Fixed maturities, available-for-sale | Prudential Netting Agreement
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		693	385
Fair Value		695	385
Fixed maturities, available-for-sale | U.S. Treasury securities and obligations of U.S. government authorities and agencies
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		14,196	15,807
Gross Unrealized Gains		3,635	4,321
Gross Unrealized Losses		20	5
Fair Value		17,811	20,123
Other-than-temporary Impairments in AOCI		0	0
Fixed maturities, available-for-sale | Obligations of U.S. states and their political subdivisions
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		7,378	5,720
Gross Unrealized Gains		614	814
Gross Unrealized Losses		106	3
Fair Value		7,886	6,531
Other-than-temporary Impairments in AOCI		0	0
Fixed maturities, available-for-sale | Foreign government bonds
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		68,681	69,894
Gross Unrealized Gains		10,342	11,164
Gross Unrealized Losses		162	117
Fair Value		78,861	80,941
Other-than-temporary Impairments in AOCI		(1)	(1)
Amortized Cost		804	821
Gross Unrealized Gains		160	184
Gross Unrealized Losses		0	0
Fair Value		964	1,005
Fixed maturities, available-for-sale | Corporate securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		144,539	143,631
Gross Unrealized Gains		14,607	17,799
Gross Unrealized Losses		2,572	1,054
Fair Value		156,574	160,376
Other-than-temporary Impairments in AOCI		(18)	(6)
Amortized Cost		696	713
Gross Unrealized Gains		60	68
Gross Unrealized Losses		2	1
Fair Value		754	780
Fixed maturities, available-for-sale | Asset-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		10,948	10,966
Gross Unrealized Gains		387	353
Gross Unrealized Losses		100	134
Fair Value		11,235	11,185
Other-than-temporary Impairments in AOCI		(565)	(592)
Fixed maturities, available-for-sale | Commercial mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		11,918	13,486
Gross Unrealized Gains		284	430
Gross Unrealized Losses		50	39
Fair Value		12,152	13,877
Other-than-temporary Impairments in AOCI		(1)	(1)
Amortized Cost		59	78
Gross Unrealized Gains		2	7
Gross Unrealized Losses		0	0
Fair Value		61	85
Fixed maturities, available-for-sale | Residential mortgage-backed securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		5,160	5,612
Gross Unrealized Gains		391	448
Gross Unrealized Losses		7	3
Fair Value		5,544	6,057
Other-than-temporary Impairments in AOCI		(4)	(5)
Amortized Cost		837	963
Gross Unrealized Gains		58	69
Gross Unrealized Losses		0	0
Fair Value		895	1,032
Equity securities, available-for-sale
Summary Of Investments Other Than Investments In Related Parties Reportable Data [Line Items]
Amortized Cost		6,870	6,921
Gross Unrealized Gains		3,119	3,023
Gross Unrealized Losses		88	83
Fair Value		$ 9,901	$ 9,861

[1] See Note 5 for details of balances associated with variable interest entities.