Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net Derivatives (2)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ (136)	$ (273)	$ (122)	$ (279)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(1)	(13)	(10)	(8)
Total realized/unrealized gains (losses) included in AOCI	4	0	1	0
Purchases (7)	0	2	0	3
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)	(1)	0	(3)	0
Balance, end of period	(134)	(284)	(134)	(284)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	(1)	(13)	(9)	(8)
Net Embedded Derivatives (3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(2,727)	(1,587)	(2,288)	(2,007)
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	(502)	231	(733)	782
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)	(221)	(142)	(429)	(273)
Transfers into Level 3 (8)	0	0	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	(3,450)	(1,498)	(3,450)	(1,498)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	(578)	183	(869)	752
Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	679	1,845	711	1,937
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	6	0	9
Total realized/unrealized gains (losses) included in AOCI	2	(70)	10	(77)
Purchases (7)	64	81	68	136
Sales (7)	(49)	(24)	(55)	(164)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	124	3	141	33
Transfers out of Level 3 (8)	(72)	(26)	(127)	(59)
Balance, end of period	748	1,815	748	1,815
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	0	6	0	7
Structured Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	228	1,195	174	1,222
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	5	0	11
Total realized/unrealized gains (losses) included in AOCI	1	0	2	(9)
Purchases (7)	15	202	15	213
Sales (7)	(9)	(54)	(28)	(119)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	60	0	87	0
Transfers out of Level 3 (8)	(187)	(87)	(142)	(57)
Balance, end of period	108	1,261	108	1,261
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	0	5	0	11
State and political subdivision
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	74	0	74	0
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	2	0	3
Purchases (7)	0	2	0	2
Sales (7)	0	0	0	0
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	4	0	3
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	74	8	74	8
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	0	0	0	0
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	5
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	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	(2)
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	(3)
Balance, end of period	0	0	0	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	0	0	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	4	123	3	124
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0	0	(1)
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases (7)	0	0	0	0
Sales (7)	0	(3)	0	(3)
Issuances (7)	0	0	0	0
Settlements (7)	0	0	0	0
Transfers into Level 3 (8)	0	0	1	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	4	120	4	120
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	0	0	0	0
Short-term Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	14
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	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	(14)
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 June 30, 2019 (9)	0	0	0	0
Separate Account Assets (4)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	7	1	5
Total realized/unrealized gains (losses) included in net income (loss) (5) (6)	0	0	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0	0	0
Purchases (7)	0	0	0	1
Sales (7)	0	(3)	(1)	(1)
Issuances (7)	0	0	0	0
Settlements (7)	0	(1)	0	(1)
Transfers into Level 3 (8)	0	1	0	0
Transfers out of Level 3 (8)	0	0	0	0
Balance, end of period	0	4	0	4
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at June 30, 2019 (9)	$ 0	$ 0	$ 0	$ 0

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

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Amount of gain (loss) recognized in the income statement 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 gain (loss) recognized in other comprehensive income (loss) 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 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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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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