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Shareholders' Equity Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net unrealized gains on securities, before tax [Abstract] |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, before tax | [1] | $ 512 | $ (266) | $ 1,169 | $ (818)
Reclassification of net (gains) losses on securities included in net income, before tax | [2] | 0 | (5) | (5) | (10)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, before tax |  | (259) | 103 | (499) | 319
Net unrealized gains (losses) on securities, before tax |  | 253 | (168) | 665 | (509)
Net unrealized gains on derivatives, before tax [Abstract] |  |  |  |  |
Reclassification of net (gains) losses on derivatives included in net income, before tax | [3] | 0 | 0 | (1) | 0
Net unrealized gains (losses) on derivatives, before tax |  | 0 | 0 | (1) | 0
Foreign currency translation, before tax |  | (15) | (46) | (9) | (16)
Total other comprehensive income (loss), before tax |  | 238 | (214) | 655 | (525)
Net unrealized gains (losses) on securities, tax impact [Abstract] |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, tax | [1] | (60) | 59 | (201) | 182
Reclassification of net (gains) losses on securities included in net income, tax |  | 0 | 1 | 1 | 2
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, tax |  | 55 | (22) | 105 | (67)
Net unrealized gains (losses) on securities, tax |  | (5) | 38 | (95) | 117
Net unrealized losses on derivatives, tax impact [Abstract] |  |  |  |  |
Reclassification of net (gains) losses on derivatives included in net income, tax |  | 0 | 0 | 0 | 0
Net unrealized gains (losses) on derivatives, tax |  | 0 | 0 | 0 | 0
Foreign currency translation, tax |  | 1 | 2 | 0 | 1
Total other comprehensive income (loss), tax |  | (4) | 40 | (95) | 118
Net unrealized gains (losses) on securities, net of tax [Abstract] |  |  |  |  |
Net unrealized gains (losses) on securities arising during the period, net of tax | [1] | 452 | (207) | 968 | (636)
Reclassification of net (gains) losses on securities included in net income, net of tax |  | 0 | (4) | (4) | (8)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables, net of tax |  | (204) | 81 | (394) | 252
Net unrealized gains (losses) on securities, net of tax |  | 248 | (130) | 570 | (392)
Net unrealized losses on derivatives, net of tax [Abstract] |  |  |  |  |
Reclassification of net (gains) losses on derivatives included in net income, net of tax |  | 0 | 0 | (1) | 0
Net unrealized gains (losses) on derivatives, net of tax |  | 0 | 0 | (1) | 0
Foreign currency translation adjustment, net of tax |  | (14) | (44) | (9) | (15)
Total other comprehensive income (loss), net of tax |  | 234 | (174) | 560 | (407)
Interest Expense, Borrowings [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 0 | 1 | 1 | 1
Net investment income [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | $ 0 | $ 1 | $ 0 | $ 1
[1] | 1) Includes OTTI losses on Available-for-Sale securities related to factors other than credit that were recognized in other comprehensive income (loss) during the period.
[2] | (2) Reclassification amounts are recorded in net investment income.
[3] | (3) Includes nil and a $1 million pretax gain reclassified to interest and debt expense for the three months ended June 30, 2019 and 2018, respectively, and nil and a $1 million pretax loss reclassified to net investment income for the three months ended June 30, 2019 and 2018, respectively

X
- Definition The amount of change in other comprehensive income, before tax, related to the unrealized gain or loss on available for sale securities that were charged to balance sheet accounts such as deferred acquisition costs, deferred sales inducement costs, unearned revenue, benefit reserves or reinsurance recoverables. + References No definition available. + Details
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- Definition The amount of tax in change in other comprehensive income related to the unrealized gain or loss on available for sale securities that were charged to balance sheet accounts such as deferred acquisition costs, deferred sales inducement costs, unearned revenue, benefit reserves or reinsurance recoverables. + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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