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Investments - Securities Available-for-Sale in Gross Unrealized Loss Position (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Corporate Bonds and Other [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	$ 1,656	$ 8,543
Gross Unrealized Losses, Less than 12 Months	39	340
Estimated Fair Value, 12 Months or Longer	1,743	825
Gross Unrealized Losses, 12 Months or Longer	60	55
Total Estimated Fair Value	3,399	9,368
Total Gross Unrealized Losses	99	395
States, Municipalities and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	14	517
Gross Unrealized Losses, Less than 12 Months		8
Estimated Fair Value, 12 Months or Longer	3	5
Gross Unrealized Losses, 12 Months or Longer		1
Total Estimated Fair Value	17	522
Total Gross Unrealized Losses		9
Residential Mortgage-Backed [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	94	1,932
Gross Unrealized Losses, Less than 12 Months		23
Estimated Fair Value, 12 Months or Longer	1,494	1,119
Gross Unrealized Losses, 12 Months or Longer	20	34
Total Estimated Fair Value	1,588	3,051
Total Gross Unrealized Losses	20	57
Commercial Mortgage-Backed [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	184	728
Gross Unrealized Losses, Less than 12 Months	2	10
Estimated Fair Value, 12 Months or Longer	236	397
Gross Unrealized Losses, 12 Months or Longer	5	22
Total Estimated Fair Value	420	1,125
Total Gross Unrealized Losses	7	32
Other Asset-Backed [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	450	834
Gross Unrealized Losses, Less than 12 Months	10	21
Estimated Fair Value, 12 Months or Longer	95	125
Gross Unrealized Losses, 12 Months or Longer	2	3
Total Estimated Fair Value	545	959
Total Gross Unrealized Losses	12	24
Total Asset-Backed [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	728	3,494
Gross Unrealized Losses, Less than 12 Months	12	54
Estimated Fair Value, 12 Months or Longer	1,825	1,641
Gross Unrealized Losses, 12 Months or Longer	27	59
Total Estimated Fair Value	2,553	5,135
Total Gross Unrealized Losses	39	113
U.S. Treasury and obligations of government-sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	48	21
Gross Unrealized Losses, Less than 12 Months	1
Estimated Fair Value, 12 Months or Longer	14	19
Total Estimated Fair Value	62	40
Total Gross Unrealized Losses	1
Foreign Government [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	32	114
Gross Unrealized Losses, Less than 12 Months	1	2
Estimated Fair Value, 12 Months or Longer	27	124
Gross Unrealized Losses, 12 Months or Longer		2
Total Estimated Fair Value	59	238
Total Gross Unrealized Losses	1	4
Fixed Maturity Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value, Less than 12 Months	2,478	12,689
Gross Unrealized Losses, Less than 12 Months	53	404
Estimated Fair Value, 12 Months or Longer	3,612	2,614
Gross Unrealized Losses, 12 Months or Longer	87	117
Total Estimated Fair Value	6,090	15,303
Total Gross Unrealized Losses	$ 140	$ 521

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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