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Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
GMDB [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 76,197 | $ 71,380
Contract value in separate accounts | [1] | 71,105 | 66,288
Net amount at risk | [1] | $ 186 | $ 1,117
Weighted average attained age | [1] | 67 years | 67 years
GMDB [Member] | Return of premium [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 59,779 | $ 55,810
Contract value in separate accounts | [1] | 57,840 | 53,872
Net amount at risk | [1] | $ 36 | $ 417
Weighted average attained age | [1] | 67 years | 67 years
GMDB [Member] | Five/six-year reset [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 8,026 | $ 7,670
Contract value in separate accounts | [1] | 5,296 | 4,941
Net amount at risk | [1] | $ 16 | $ 112
Weighted average attained age | [1] | 67 years | 67 years
GMDB [Member] | One-year ratchet [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 5,891 | $ 5,560
Contract value in separate accounts | [1] | 5,545 | 5,210
Net amount at risk | [1] | $ 48 | $ 417
Weighted average attained age | [1] | 70 years | 70 years
GMDB [Member] | Five-year ratchet [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 1,388 | $ 1,307
Contract value in separate accounts | [1] | 1,331 | 1,251
Net amount at risk | [1] | $ 2 | $ 23
Weighted average attained age | [1] | 66 years | 66 years
GMDB [Member] | Other [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 1,113 | $ 1,033
Contract value in separate accounts | [1] | 1,093 | 1,014
Net amount at risk | [1] | $ 84 | $ 148
Weighted average attained age | [1] | 72 years | 72 years
GGU death benefit [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 1,058 | $ 992
Contract value in separate accounts | [1] | 1,006 | 940
Net amount at risk | [1] | $ 119 | $ 112
Weighted average attained age | [1] | 70 years | 70 years
GMIB [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 190 | $ 180
Contract value in separate accounts | [1] | 175 | 164
Net amount at risk | [1] | $ 8 | $ 12
Weighted average attained age | [1] | 70 years | 69 years
GMWB [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 46,109 | $ 42,956
Contract value in separate accounts | [1] | 46,014 | 42,860
Net amount at risk | [1] | $ 362 | $ 745
Weighted average attained age | [1] | 68 years | 68 years
GMWB [Member] | GMWB standard benefit [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 2,084 | $ 1,990
Contract value in separate accounts | [1] | 2,078 | 1,984
Net amount at risk | [1] | $ 2 | $ 3
Weighted average attained age | [1] | 72 years | 72 years
GMWB [Member] | GMWB for life [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 44,025 | $ 40,966
Contract value in separate accounts | [1] | 43,936 | 40,876
Net amount at risk | [1] | $ 360 | $ 742
Weighted average attained age | [1] | 68 years | 68 years
GMAB [Member] |  |  |
Variable Annuity Guarantees by Benefit Type |  |  |
Total contract value | [1] | $ 2,571 | $ 2,456
Contract value in separate accounts | [1] | 2,565 | 2,450
Net amount at risk | [1] | $ 2 | $ 24
Weighted average attained age | [1] | 59 years | 59 years
[1] | Individual variable annuity contracts may have more than one guarantee and therefore may be included in more than one benefit type. Variable annuity contracts for which the death benefit equals the account value are not shown in this table.

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- Definition Value of the general accounts corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Net amount at risk, representing the guaranteed benefit in excess of the current account balance corresponding to the specified product, guarantee type and subset of the guarantee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(3),(5) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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- Definition Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph ((d)(5)) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 + Details
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