Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Assets
Mortgage loans	$ 14,118	$ 10,631
Restricted cash	199	492
Consolidated Entity Excluding Variable Interest Entities (VIE)
Assets
Available-for-sale securities	73,271
Reinsurance recoverable	5,697	5,534
Liabilities
Interest sensitive contract liabilities	101,666	96,610
Future policy benefits	22,909	16,704
Derivative liabilities	46	85
Funds withheld liability	768	721
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Related Party
Assets
Available-for-sale securities	2,368	1,437
Trading securities, at fair value	306	249
Equity securities	381	120
Mortgage loans	653	291
Funds withheld at interest	13,560	13,577
Other investments	387	386
Reinsurance recoverable	320	344
Liabilities
Interest sensitive contract liabilities	15,693	16,850
Future policy benefits	1,474	1,259
Funds withheld liability	347	337
Consolidated Entity Excluding Variable Interest Entities (VIE) \| CLO \| Related Party
Assets
Available-for-sale securities	818	562
Consolidated Entity Excluding Variable Interest Entities (VIE) \| ABS \| Related Party
Assets
Available-for-sale securities	1,526	875
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring
Assets
Investment funds		801
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1
Assets
Available-for-sale securities	37	54
Trading securities, at fair value	3	3
Equity securities	45	40
Mortgage loans	0	0
Investment funds	0	0
Derivative assets	7	9
Short-term investments	54	66
Other investments	0	0
Cash and cash equivalents	3,833	2,911
Restricted cash	199	492
Reinsurance recoverable	0	0
Total assets measured at fair value	4,181	3,614
Liabilities
Derivative liabilities	0	3
Total liabilities measured at fair value	1	3
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Related Party
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Equity securities	0	0
Investment funds	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Universal life
Liabilities
Interest sensitive contract liabilities	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| AmerUs Closed Block
Liabilities
Future policy benefits	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| ILICO Closed Block and life benefits
Liabilities
Future policy benefits	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Embedded derivatives
Assets
Funds withheld at interest	0	0
Liabilities
Interest sensitive contract liabilities	0	0
Funds withheld liability	1	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Embedded derivatives \| Related Party
Assets
Funds withheld at interest	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| U.S. government and agencies
Assets
Available-for-sale securities	37	54
Trading securities, at fair value	3	3
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| U.S. state, municipal and political subdivisions
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Foreign governments
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Corporate
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| Corporate \| Related Party
Assets
Available-for-sale securities	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| CLO
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| CLO \| Related Party
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| ABS
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| ABS \| Related Party
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| CMBS
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 1 \| RMBS
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2
Assets
Available-for-sale securities	68,129	56,348
Trading securities, at fair value	2,228	1,811
Equity securities	313	173
Mortgage loans	0	0
Investment funds	0	0
Derivative assets	2,379	1,034
Short-term investments	291	125
Other investments	64	52
Cash and cash equivalents	0	0
Restricted cash	0	0
Reinsurance recoverable	0	0
Total assets measured at fair value	74,819	60,674
Liabilities
Derivative liabilities	35	78
Total liabilities measured at fair value	76	77
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Related Party
Assets
Available-for-sale securities	1,374	1,109
Trading securities, at fair value	41	22
Equity securities	0	0
Investment funds	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Universal life
Liabilities
Interest sensitive contract liabilities	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| AmerUs Closed Block
Liabilities
Future policy benefits	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| ILICO Closed Block and life benefits
Liabilities
Future policy benefits	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Embedded derivatives
Assets
Funds withheld at interest	0	0
Liabilities
Interest sensitive contract liabilities	0	0
Funds withheld liability	41	(1)
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Embedded derivatives \| Related Party
Assets
Funds withheld at interest	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| U.S. government and agencies
Assets
Available-for-sale securities	0	3
Trading securities, at fair value	3	2
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| U.S. state, municipal and political subdivisions
Assets
Available-for-sale securities	1,452	1,293
Trading securities, at fair value	140	126
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Foreign governments
Assets
Available-for-sale securities	328	161
Trading securities, at fair value	24
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Corporate
Assets
Available-for-sale securities	46,098	36,199
Trading securities, at fair value	1,701	1,287
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| Corporate \| Related Party
Assets
Available-for-sale securities	24
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| CLO
Assets
Available-for-sale securities	6,740	5,254
Trading securities, at fair value	26	8
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| CLO \| Related Party
Assets
Available-for-sale securities	818	562
Trading securities, at fair value	41	22
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| ABS
Assets
Available-for-sale securities	3,823	3,305
Trading securities, at fair value	9	87
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| ABS \| Related Party
Assets
Available-for-sale securities	532	547
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| CMBS
Assets
Available-for-sale securities	2,434	2,170
Trading securities, at fair value	51	49
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 2 \| RMBS
Assets
Available-for-sale securities	7,254	7,963
Trading securities, at fair value	274	252
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3
Assets
Available-for-sale securities	2,737	2,863
Trading securities, at fair value	180	135
Equity securities	1	3
Mortgage loans	28	32
Investment funds	22	29
Derivative assets	0	0
Short-term investments	226	0
Other investments	0	0
Cash and cash equivalents	0	0
Restricted cash	0	0
Reinsurance recoverable	1,954	1,676
Total assets measured at fair value	8,412	5,528
Liabilities
Derivative liabilities	0	4
Total liabilities measured at fair value	13,788	11,078
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Related Party
Assets
Available-for-sale securities	994	328
Trading securities, at fair value	265	227
Equity securities	381	120
Investment funds	127	105
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Universal life
Liabilities
Interest sensitive contract liabilities	1,142	932
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| AmerUs Closed Block
Liabilities
Future policy benefits	1,572	1,443
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| ILICO Closed Block and life benefits
Liabilities
Future policy benefits	797	730
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Embedded derivatives
Assets
Funds withheld at interest	804	57
Liabilities
Interest sensitive contract liabilities	10,273	7,969
Funds withheld liability	4	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Embedded derivatives \| Related Party
Assets
Funds withheld at interest	655	(110)
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| U.S. government and agencies
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| U.S. state, municipal and political subdivisions
Assets
Available-for-sale securities	40	0
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Foreign governments
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Corporate
Assets
Available-for-sale securities	947	898
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| Corporate \| Related Party
Assets
Available-for-sale securities	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| CLO
Assets
Available-for-sale securities	131	107
Trading securities, at fair value	6	1
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| CLO \| Related Party
Assets
Available-for-sale securities	0	0
Trading securities, at fair value	41	78
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| ABS
Assets
Available-for-sale securities	1,288	1,615
Trading securities, at fair value	83	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| ABS \| Related Party
Assets
Available-for-sale securities	994	328
Trading securities, at fair value	224	149
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| CMBS
Assets
Available-for-sale securities	331	187
Trading securities, at fair value	0	0
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Level 3 \| RMBS
Assets
Available-for-sale securities	0	56
Trading securities, at fair value	91	134
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| NAV
Assets
Investment funds	134	153
Total assets measured at fair value	812
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| NAV \| Related Party
Assets
Investment funds	122	96
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE)
Assets
Mortgage loans	13,918	10,424
Investment funds	556	521
Funds withheld at interest	14,476	14,966
Other investments	66	70
Total assets measured at fair value	46,015	42,895
Liabilities
Interest sensitive contract liabilities	57,241	51,655
Funds withheld liability	733	722
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Related Party
Assets
Mortgage loans	645	290
Investment funds	2,514	2,031
Funds withheld at interest	12,905	13,687
Other investments	419	361
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 1
Assets
Mortgage loans	0	0
Investment funds	0	0
Funds withheld at interest	0	0
Other investments	0	0
Total assets measured at fair value	0	0
Liabilities
Interest sensitive contract liabilities	0	0
Funds withheld liability	0	0
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 1 \| Related Party
Assets
Mortgage loans	0	0
Investment funds	0	0
Funds withheld at interest	0	0
Other investments	0	0
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 2
Assets
Mortgage loans	0	0
Investment funds	0	0
Funds withheld at interest	0	0
Other investments	0	0
Total assets measured at fair value	466	488
Liabilities
Interest sensitive contract liabilities	0	0
Funds withheld liability	733	722
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 2 \| Related Party
Assets
Mortgage loans	0	0
Investment funds	0	0
Funds withheld at interest	0	0
Other investments	0	0
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 3
Assets
Mortgage loans	13,918	10,424
Investment funds	0	0
Funds withheld at interest	14,476	14,966
Other investments	66	70
Total assets measured at fair value	42,429	39,798
Liabilities
Interest sensitive contract liabilities	57,241	51,655
Funds withheld liability	0	0
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Level 3 \| Related Party
Assets
Mortgage loans	645	290
Investment funds	0	0
Funds withheld at interest	12,905	13,687
Other investments	419	361
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| NAV
Assets
Investment funds	556	521
Total assets measured at fair value	3,120	2,609
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| NAV \| Related Party
Assets
Investment funds	2,514	2,031
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring
Assets
Available-for-sale securities	70,903	59,265
Trading securities, at fair value	2,411	1,949
Equity securities	359	216
Mortgage loans	28	32
Investment funds	156	182
Derivative assets	2,386	1,043
Short-term investments	571	191
Other investments	64	52
Cash and cash equivalents	3,833	2,911
Restricted cash	199	492
Reinsurance recoverable	1,954	1,676
Total assets measured at fair value	88,224	70,617
Liabilities
Interest sensitive contract liabilities	11,415	8,901
Future policy benefits	2,369	2,173
Derivative liabilities	46	85
Funds withheld liability	35	(1)
Total liabilities measured at fair value	13,865	11,158
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Related Party
Assets
Available-for-sale securities	2,368	1,437
Trading securities, at fair value	306	249
Equity securities	381	120
Investment funds	249	201
Funds withheld at interest	655	(110)
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Universal life
Liabilities
Interest sensitive contract liabilities	1,142	932
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| AmerUs Closed Block
Liabilities
Future policy benefits	1,572	1,443
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| ILICO Closed Block and life benefits
Liabilities
Future policy benefits	797	730
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Embedded derivatives
Assets
Funds withheld at interest	804	57
Liabilities
Interest sensitive contract liabilities	10,273	7,969
Funds withheld liability	35	(1)
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Embedded derivatives \| Related Party
Assets
Funds withheld at interest	655	(110)
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| U.S. government and agencies
Assets
Available-for-sale securities	37	57
Trading securities, at fair value	6	5
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| U.S. state, municipal and political subdivisions
Assets
Available-for-sale securities	1,492	1,293
Trading securities, at fair value	140	126
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Foreign governments
Assets
Available-for-sale securities	328	161
Trading securities, at fair value	24
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Corporate
Assets
Available-for-sale securities	47,045	37,097
Trading securities, at fair value	1,701	1,287
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| Corporate \| Related Party
Assets
Available-for-sale securities	24
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| CLO
Assets
Available-for-sale securities	6,871	5,361
Trading securities, at fair value	32	9
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| CLO \| Related Party
Assets
Available-for-sale securities	818	562
Trading securities, at fair value	82	100
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| ABS
Assets
Available-for-sale securities	5,111	4,920
Trading securities, at fair value	92	87
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| ABS \| Related Party
Assets
Available-for-sale securities	1,526	875
Trading securities, at fair value	224	149
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| CMBS
Assets
Available-for-sale securities	2,765	2,357
Trading securities, at fair value	51	49
Fair Value \| Consolidated Entity Excluding Variable Interest Entities (VIE) \| Recurring \| RMBS
Assets
Available-for-sale securities	7,254	8,019
Trading securities, at fair value	365	386
Variable Interest Entities
Assets
Trading securities, at fair value	19	35
Variable Interest Entities \| Related Party
Assets
Trading securities, at fair value	1	35
Equity securities	6	50
Variable Interest Entities \| Recurring \| Level 1
Assets
Trading securities, at fair value		0
Equity securities		37
Investment funds	0	0
Cash and cash equivalents	3	2
Variable Interest Entities \| Recurring \| Level 1 \| Related Party
Assets
Trading securities, at fair value	0
Equity securities	0
Variable Interest Entities \| Recurring \| Level 2
Assets
Trading securities, at fair value		0
Equity securities		0
Investment funds	0	0
Cash and cash equivalents	0	0
Variable Interest Entities \| Recurring \| Level 2 \| Related Party
Assets
Trading securities, at fair value	0
Equity securities	0
Variable Interest Entities \| Recurring \| Level 3
Assets
Trading securities, at fair value	19	35
Equity securities		13
Investment funds	13	15
Cash and cash equivalents	0	0
Variable Interest Entities \| Recurring \| Level 3 \| Related Party
Assets
Equity securities	6
Variable Interest Entities \| Recurring \| NAV
Assets
Investment funds		552
Variable Interest Entities \| Recurring \| NAV \| Related Party
Assets
Investment funds	556
Variable Interest Entities \| Fair Value \| Related Party
Assets
Investment funds	50	57
Variable Interest Entities \| Fair Value \| Level 1 \| Related Party
Assets
Investment funds	0	0

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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