Investments (Schedule Of Amortized Cost And Fair Value Of Fixed Maturities And Related Other-Than-Temporary Impairment Recognized In Accumulated Other Comprehensive Income) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Investment [Line Items]
Available for sale, Amortized Cost	$ 48,406	$ 44,666
Available for sale, Gross Unrealized Appreciation	1,465	2,725
Available for sale, Gross Unrealized Depreciation	(617)	(85)
Available for sale, Fair Value	49,254	47,306
Available for sale, OTTI recognized in AOCI	(40)	(91)
Held to maturity, Amortized Cost	6,098	7,270
Held to maturity, Gross Unrealized Appreciation	187	367
Held to maturity, Gross Unrealized Depreciation	(22)	(4)
Held to maturity, Fair Value	6,263	7,633
Held to maturity, OTTI recognized in AOCI
U.S. Treasury and agency
Investment [Line Items]
Available for sale, Amortized Cost	2,946	3,553
Available for sale, Gross Unrealized Appreciation	62	183
Available for sale, Gross Unrealized Depreciation	(59)	(1)
Available for sale, Fair Value	2,949	3,735
Available for sale, OTTI recognized in AOCI	0	0
Held to maturity, Amortized Cost	820	1,044
Held to maturity, Gross Unrealized Appreciation	16	39
Held to maturity, Gross Unrealized Depreciation	(4)	0
Held to maturity, Fair Value	832	1,083
Held to maturity, OTTI recognized in AOCI	0	0
Foreign
Investment [Line Items]
Available for sale, Amortized Cost	14,336	13,016
Available for sale, Gross Unrealized Appreciation	377	711
Available for sale, Gross Unrealized Depreciation	(122)	(14)
Available for sale, Fair Value	14,591	13,713
Available for sale, OTTI recognized in AOCI	0	0
Held to maturity, Amortized Cost	864	910
Held to maturity, Gross Unrealized Appreciation	33	54
Held to maturity, Gross Unrealized Depreciation	0	0
Held to maturity, Fair Value	897	964
Held to maturity, OTTI recognized in AOCI	0	0
Corporate securities
Investment [Line Items]
Available for sale, Amortized Cost	16,825	15,529
Available for sale, Gross Unrealized Appreciation	777	1,210
Available for sale, Gross Unrealized Depreciation	(132)	(31)
Available for sale, Fair Value	17,470	16,708
Available for sale, OTTI recognized in AOCI	(6)	(7)
Held to maturity, Amortized Cost	1,922	2,133
Held to maturity, Gross Unrealized Appreciation	83	142
Held to maturity, Gross Unrealized Depreciation	0	0
Held to maturity, Fair Value	2,005	2,275
Held to maturity, OTTI recognized in AOCI	0	0
Mortgage backed-securities
Investment [Line Items]
Available for sale, Amortized Cost	10,937	10,051
Available for sale, Gross Unrealized Appreciation	184	458
Available for sale, Gross Unrealized Depreciation	(227)	(36)
Available for sale, Fair Value	10,894	10,473
Available for sale, OTTI recognized in AOCI	(34)	(84)
Held to maturity, Amortized Cost	1,341	2,028
Held to maturity, Gross Unrealized Appreciation	39	88
Held to maturity, Gross Unrealized Depreciation	(1)	0
Held to maturity, Fair Value	1,379	2,116
Held to maturity, OTTI recognized in AOCI	0	0
States, municipalities, and political subdivisions
Investment [Line Items]
Available for sale, Amortized Cost	3,362	2,517
Available for sale, Gross Unrealized Appreciation	65	163
Available for sale, Gross Unrealized Depreciation	(77)	(3)
Available for sale, Fair Value	3,350	2,677
Available for sale, OTTI recognized in AOCI	0	0
Held to maturity, Amortized Cost	1,151	1,155
Held to maturity, Gross Unrealized Appreciation	16	44
Held to maturity, Gross Unrealized Depreciation	(17)	(4)
Held to maturity, Fair Value	1,150	1,195
Held to maturity, OTTI recognized in AOCI	$ 0	$ 0