Fair Value (Unobservable Input Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Net Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	$ (279)	$ (954)
Total realized/unrealized gains (losses) included in net income (loss)	5	(10)
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	1	0
Sales	0	0
Issuances	0	0
Settlements	0	74
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(273)	(890)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	5	(12)
Net Embedded Derivatives
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Balance, beginning of period	(2,007)	(2,761)
Total realized/unrealized gains (losses) included in net income (loss)	551	317
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	(131)	67
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	(1,587)	(2,377)
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	569	286
U.S. and foreign corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,937	2,310
Total realized/unrealized gains (losses) included in net income (loss)	3	(3)
Total realized/unrealized gains (losses) included in AOCI	(8)	113
Purchases	66	122
Sales	(102)	(59)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	82	0
Transfers out of Level 3	(133)	(139)
Balance, end of period	1,845	2,344
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	1	2
Structured securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	1,222	1,695
Total realized/unrealized gains (losses) included in net income (loss)	6	3
Total realized/unrealized gains (losses) included in AOCI	(11)	15
Purchases	94	52
Sales	(65)	(107)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	11
Transfers out of Level 3	(51)	(43)
Balance, end of period	1,195	1,626
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	6	3
State and political subdivision
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	17
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	(10)
Balance, end of period	0	7
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Foreign government
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5	0
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	(5)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	0	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	124	137
Total realized/unrealized gains (losses) included in net income (loss)	(1)	0
Total realized/unrealized gains (losses) included in AOCI	0	2
Purchases	0	3
Sales	0	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	123	142
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Real estate joint ventures
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	22	0
Total realized/unrealized gains (losses) included in net income (loss)	1	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	(1)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	22	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	1	0
Other limited partnership interests
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	28	0
Total realized/unrealized gains (losses) included in net income (loss)	(1)	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	0
Sales	(1)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Balance, end of period	26	0
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	(1)	0
Short-term investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	14	2
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	0	1
Sales	0	(1)
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	(14)	(1)
Balance, end of period	0	1
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	0	0
Separate account assets
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	5	10
Total realized/unrealized gains (losses) included in net income (loss)	0	0
Total realized/unrealized gains (losses) included in AOCI	0	0
Purchases	3	0
Sales	(1)	0
Issuances	0	0
Settlements	0	0
Transfers into Level 3	0	5
Transfers out of Level 3	0	0
Balance, end of period	7	15
Changes in unrealized gains (losses) included in net income (loss) for the instruments still held at end of period	$ 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 for 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 the income statement for a 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 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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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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