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Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
GMDB and GGU [Member] |  |  |
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees |  |  |
Balance, at the beginning of the period |  | $ 19 | $ 17
Incurred claims |  | 0 | 5
Paid claims |  | (4) | (4)
Balance, at the end of the period |  | 15 | 18
GMIB [Member] |  |  |
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees |  |  |
Balance, at the beginning of the period |  | 8 | 6
Incurred claims |  | (1) |
Balance, at the end of the period |  | 7 | 6
GMWB [Member] |  |  |
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees |  |  |
Balance, at the beginning of the period |  | 875 | 463
Incurred claims | [1] | 1,245 | (588)
Balance, at the end of the period |  | 2,120 | (125)
GMAB [Member] |  |  |
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees |  |  |
Balance, at the beginning of the period |  | (19) | (80)
Incurred claims | [1] | 0 | (3)
Balance, at the end of the period |  | (19) | (83)
UL [Member] |  |  |
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees |  |  |
Balance, at the beginning of the period |  | 659 | 489
Incurred claims |  | 110 | 171
Paid claims |  | (34) | (19)
Balance, at the end of the period |  | $ 735 | $ 641
[1] | The incurred claims for GMWB and GMAB include the change in the fair value of the liabilities (contra liabilities) less paid claims.

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- Definition Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date. + References Reference 1: 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=117418410&loc=d3e7104-158389 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473 + Details
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- Definition Amount of guaranteed minimum benefit expense incurred for expected guaranteed minimum benefits in excess of projected account values. + References Reference 1: 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=117418410&loc=d3e7104-158389 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473 + Details
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- Definition Amount of cash outflow to policyholders and contract holders for guaranteed minimum benefit payments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=117418410&loc=d3e7104-158389 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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