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Investments - Amortized Cost and Fair Values of Securities (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	$ 39,391	$ 38,231
Gross Unrealized Gains	4,239	2,773
Gross Unrealized Losses	150	551
Estimated Fair Value	43,480	40,453
Unrealized OTTI Losses (Gains)	(52)	(41)
Fixed Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	38,810	37,407
Gross Unrealized Gains	4,147	2,707
Gross Unrealized Losses	63	413
Estimated Fair Value	42,894	39,701
Unrealized OTTI Losses (Gains)	(52)	(41)
Corporate and Other Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	17,985	17,097
Gross Unrealized Gains	1,867	1,019
Gross Unrealized Losses	36	347
Estimated Fair Value	19,816	17,769
Unrealized OTTI Losses (Gains)	(1)
States, Municipalities and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	11,566	11,729
Gross Unrealized Gains	1,937	1,453
Gross Unrealized Losses	2	8
Estimated Fair Value	13,501	13,174
Unrealized OTTI Losses (Gains)	(27)	(4)
Residential Mortgage-Backed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	5,174	4,935
Gross Unrealized Gains	206	154
Gross Unrealized Losses	15	17
Estimated Fair Value	5,365	5,072
Unrealized OTTI Losses (Gains)	(24)	(37)
Commercial Mortgage-Backed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	2,064	2,154
Gross Unrealized Gains	88	55
Gross Unrealized Losses	8	12
Estimated Fair Value	2,144	2,197
Other Asset-Backed [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	948	923
Gross Unrealized Gains	12	6
Gross Unrealized Losses	1	8
Estimated Fair Value	959	921
Total Asset-Backed [Member] | Fixed Maturity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	8,186	8,012
Gross Unrealized Gains	306	215
Gross Unrealized Losses	24	37
Estimated Fair Value	8,468	8,190
Unrealized OTTI Losses (Gains)	(24)	(37)
U.S. Treasury and Obligations of Government-Sponsored Enterprises [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	68	62
Gross Unrealized Gains	8	5
Estimated Fair Value	76	67
Foreign Government [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	415	334
Gross Unrealized Gains	23	13
Gross Unrealized Losses		1
Estimated Fair Value	438	346
Redeemable Preferred Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	18	33
Gross Unrealized Gains	2	2
Estimated Fair Value	20	35
Total Fixed Maturities Available-for-Sale [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	38,238	37,267
Gross Unrealized Gains	4,143	2,707
Gross Unrealized Losses	62	393
Estimated Fair Value	42,319	39,581
Unrealized OTTI Losses (Gains)	(52)	(41)
Fixed Maturities Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	572	140
Gross Unrealized Gains	4
Gross Unrealized Losses	1	20
Estimated Fair Value	575	120
Common Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	15	46
Gross Unrealized Gains	6	3
Gross Unrealized Losses	1	1
Estimated Fair Value	20	48
Preferred Stock [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	93	145
Gross Unrealized Gains	5	7
Gross Unrealized Losses	2	3
Estimated Fair Value	96	149
Equity Securities Available-for-Sale [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	108	191
Gross Unrealized Gains	11	10
Gross Unrealized Losses	3	4
Estimated Fair Value	116	197
Equity Securities Trading [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	473	633
Gross Unrealized Gains	81	56
Gross Unrealized Losses	84	134
Estimated Fair Value	470	555
Equity Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Cost or Amortized Cost	581	824
Gross Unrealized Gains	92	66
Gross Unrealized Losses	87	138
Estimated Fair Value	$ 586	$ 752

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