Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ 50	$ (136)	$ 16	$ (122)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(3)	(1)	(2)	(10)
Total realized/unrealized gains (losses) included in AOCI	(11)	4	20	1
Purchases (7)	0	0	0	0
Sales (7)	(16)	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	(1)	0	(3)
Balance, end of period	20	(134)	20	(134)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	3	(1)	(17)	(9)
Changes in unrealized gains (losses) included in OCI	(10)		20
Embedded derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(4,747)	(2,727)	(4,365)	(2,288)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(880)	(502)	(1,113)	(733)
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)	(177)	(221)	(326)	(429)
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	(5,804)	(3,450)	(5,804)	(3,450)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(924)	(578)	(1,166)	(869)
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	838	679	457	711
Total realized/unrealized gains (losses) included in net income (loss)	(2)	0	(4)	0
Total realized/unrealized gains(losses) included in AOCI	60	2	16	10
Purchases (7)	186	64	444	68
Sales (7)	(46)	(49)	(45)	(55)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	86	124	158	141
Transfers out of Level 3 (8)	(228)	(72)	(132)	(127)
Balance, end of period	894	748	894	748
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	58		15
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	218	228	117	174
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains(losses) included in AOCI	3	1	0	2
Purchases (7)	85	15	104	15
Sales (7)	(1)	(9)	(6)	(28)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	26	60	30	87
Transfers out of Level 3 (8)	(158)	(187)	(72)	(142)
Balance, end of period	173	108	173	108
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	3		0
State and Political Subdivision
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	72	74	73	74
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
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)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	(72)	0	(73)	0
Balance, end of period	0	74	0	74
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
Foreign Government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	7	0	0	0
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
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)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	(7)	0	0	0
Balance, end of period	0	0	0	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
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4	4	8	3
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
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)	0	0	0	0
Transfers into Level 3 (8)	0	0	0	1
Transfers out of Level 3 (8)	(1)	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	2	0	5	0
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains(losses) included in AOCI	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	(2)	0	(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	0	0	0	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	4	0	3	1
Total realized/unrealized gains (losses) included in net income (loss)	0	0	0	0
Total realized/unrealized gains(losses) included in AOCI	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)	(1)	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 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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