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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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