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Investments - Amortized Cost and Fair Values of Fixed Maturity and Equity Securities (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | $ 38,045 | $ 38,234
Gross Unrealized Gains | 3,675 | 1,986
Gross Unrealized Losses | 57 | 521
Estimated Fair Value | 41,663 | 39,699
Unrealized OTTI Losses (Gains) | (26) | (20)
Corporate Bonds and Other [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 19,654 | 18,764
Gross Unrealized Gains | 1,880 | 791
Gross Unrealized Losses | 44 | 395
Estimated Fair Value | 21,490 | 19,160
States, Municipalities and Political Subdivisions [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 9,196 | 9,681
Gross Unrealized Gains | 1,507 | 1,076
Gross Unrealized Losses |  | 9
Estimated Fair Value | 10,703 | 10,748
Residential Mortgage-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 4,668 | 4,815
Gross Unrealized Gains | 131 | 68
Gross Unrealized Losses | 2 | 57
Estimated Fair Value | 4,797 | 4,826
Unrealized OTTI Losses (Gains) | (24) | (20)
Commercial Mortgage-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 2,032 | 2,200
Gross Unrealized Gains | 93 | 28
Gross Unrealized Losses | 4 | 32
Estimated Fair Value | 2,121 | 2,196
Other Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 1,865 | 1,975
Gross Unrealized Gains | 40 | 11
Gross Unrealized Losses | 7 | 24
Estimated Fair Value | 1,898 | 1,962
Unrealized OTTI Losses (Gains) | (2) |
Total Asset-Backed [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 8,565 | 8,990
Gross Unrealized Gains | 264 | 107
Gross Unrealized Losses | 13 | 113
Estimated Fair Value | 8,816 | 8,984
Unrealized OTTI Losses (Gains) | (26) | (20)
U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 118 | 156
Gross Unrealized Gains | 5 | 3
Estimated Fair Value | 123 | 159
Foreign Government [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 480 | 480
Gross Unrealized Gains | 17 | 5
Gross Unrealized Losses |  | 4
Estimated Fair Value | 497 | 481
Redeemable Preferred Stock [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 10 | 10
Estimated Fair Value | 10 | 10
Total Fixed Maturities Available-for-Sale [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 38,023 | 38,081
Gross Unrealized Gains | 3,673 | 1,982
Gross Unrealized Losses | 57 | 521
Estimated Fair Value | 41,639 | 39,542
Unrealized OTTI Losses (Gains) | (26) | (20)
Fixed Maturities Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Cost or Amortized Cost | 22 | 153
Gross Unrealized Gains | 2 | 4
Estimated Fair Value | $ 24 | $ 157

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