Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 20	$ (134)	$ 16	$ (122)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	5	(2)	3	(10)
Total realized/unrealized gains (losses) included in AOCI	(10)	3	10	5
Purchases (7)	0	0	0	0
Sales (7)	0	0	(14)	0
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	2	0	(4)
Balance, end of period	15	(131)	15	(131)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	5	(2)	(11)	(11)
Changes in unrealized gains (losses) included in OCI	(10)		10
Embedded derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(5,326)	(3,121)	(4,031)	(1,998)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(628)	(630)	(1,590)	(1,316)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	0	0	0	0
Issuances (7)	0	0	0	0
Settlements (7)	(174)	(219)	(507)	(656)
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	(6,128)	(3,970)	(6,128)	(3,970)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(668)	(705)	(1,687)	(1,531)
Changes in unrealized gains (losses) included in OCI	0		0
Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	894	765	461	732
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1)	0	(2)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	7	0	12	11
Purchases (7)	199	118	509	179
Sales (7)	(64)	(22)	(103)	(78)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	185	49	285	147
Transfers out of Level 3 (8)	(142)	(84)	(84)	(165)
Balance, end of period	1,078	826	1,078	826
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	(1)	0
Changes in unrealized gains (losses) included in OCI	8		12
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	173	108	117	173
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1	1	1	3
Purchases (7)	11	61	34	75
Sales (7)	(1)	(6)	(2)	(24)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	29	9	92
Transfers out of Level 3 (8)	(103)	(18)	(78)	(145)
Balance, end of period	81	175	81	175
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	1
Changes in unrealized gains (losses) included in OCI	1		2
State and Political Subdivision
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	74	73	74
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	0	(1)	0	(1)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	(73)	0
Balance, end of period	0	73	0	73
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in OCI	0		0
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4	4	8	3
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1)	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	0	0	0	0
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	1
Transfers out of Level 3 (8)	0	0	(5)	0
Balance, end of period	3	4	3	4
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in OCI	0		0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	6	5	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Purchases (7)	10	0	10	0
Sales (7)	0	(6)	(5)	0
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	10	0	10	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0	0	0
Changes in unrealized gains (losses) included in OCI	0		0
Separate Account Assets (4)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	3	0	3	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	0	0	0	(1)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	3	0	3	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	$ 0	0	$ 0
Changes in unrealized gains (losses) included in OCI	$ 0		$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset) out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held.

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