INVESTMENTS - Mortgage Loans by Loan-to-Value with Debt Service Coverage Ratios and Age Analysis of Past Due Mortgage Loans (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Individually evaluated for impairment	$ 0	$ 7
Commercial Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Recorded investment, nonaccrual status	0	19
Individually evaluated for impairment	0	7
Face amount of mortgage loans	9,373	9,130
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	27
Current	9,373	9,103
Total Financing Receivables	9,373	9,130
Recorded Investment 90 Days or More and Accruing	0	0
Commercial Mortgage Loans \| 30-59 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial Mortgage Loans \| 60-89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	0
Commercial Mortgage Loans \| 90 Days Or Greater
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	0	27
Commercial Mortgage Loans \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	5,235	5,948
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	5,235	5,948
Commercial Mortgage Loans \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,331	677
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,331	677
Commercial Mortgage Loans \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,546	1,510
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,546	1,510
Commercial Mortgage Loans \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	973	746
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	973	746
Commercial Mortgage Loans \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	288	249
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	288	249
Commercial Mortgage Loans \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 0% - 50%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,163	1,072
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,163	1,072
Commercial Mortgage Loans \| 0% - 50% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	887	780
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	887	780
Commercial Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	38	21
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	38	21
Commercial Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	214	247
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	214	247
Commercial Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	24	24
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	24	24
Commercial Mortgage Loans \| 0% - 50% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 0% - 50% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 50% - 70%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	7,447	7,186
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	7,447	7,186
Commercial Mortgage Loans \| 50% - 70% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	4,097	4,908
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	4,097	4,908
Commercial Mortgage Loans \| 50% - 70% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,195	656
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,195	656
Commercial Mortgage Loans \| 50% - 70% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,118	1,146
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,118	1,146
Commercial Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	795	325
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	795	325
Commercial Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	242	151
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	242	151
Commercial Mortgage Loans \| 50% - 70% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 70% - 90%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	763	845
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	763	845
Commercial Mortgage Loans \| 70% - 90% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	251	260
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	251	260
Commercial Mortgage Loans \| 70% - 90% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	98	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	98	0
Commercial Mortgage Loans \| 70% - 90% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	214	117
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	214	117
Commercial Mortgage Loans \| 70% - 90% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	154	370
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	154	370
Commercial Mortgage Loans \| 70% - 90% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	46	98
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	46	98
Commercial Mortgage Loans \| 70% - 90% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 90% plus
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	27
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	27
Commercial Mortgage Loans \| 90% plus \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 90% plus \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 90% plus \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 90% plus \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	27
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	27
Commercial Mortgage Loans \| 90% plus \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Commercial Mortgage Loans \| 90% plus \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	2,717	2,695
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	124	68
Current	2,593	2,627
Total Financing Receivables	2,717	2,695
Recorded Investment 90 Days or More and Accruing	66	40
Agricultural Mortgage Loans \| 30-59 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	57	18
Agricultural Mortgage Loans \| 60-89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1	8
Agricultural Mortgage Loans \| 90 Days Or Greater
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	66	42
Agricultural Mortgage Loans \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	404	394
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	404	394
Agricultural Mortgage Loans \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	191	193
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	191	193
Agricultural Mortgage Loans \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	477	513
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	477	513
Agricultural Mortgage Loans \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	990	941
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	990	941
Agricultural Mortgage Loans \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	572	572
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	572	572
Agricultural Mortgage Loans \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	83	82
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	83	82
Agricultural Mortgage Loans \| 0% - 50%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,583	1,611
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,583	1,611
Agricultural Mortgage Loans \| 0% - 50% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	322	282
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	322	282
Agricultural Mortgage Loans \| 0% - 50% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	104	147
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	104	147
Agricultural Mortgage Loans \| 0% - 50% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	241	267
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	241	267
Agricultural Mortgage Loans \| 0% - 50% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	545	543
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	545	543
Agricultural Mortgage Loans \| 0% - 50% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	321	321
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	321	321
Agricultural Mortgage Loans \| 0% - 50% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	50	51
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	50	51
Agricultural Mortgage Loans \| 50% - 70%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,115	1,038
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,115	1,038
Agricultural Mortgage Loans \| 50% - 70% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	82	112
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	82	112
Agricultural Mortgage Loans \| 50% - 70% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	87	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	87	46
Agricultural Mortgage Loans \| 50% - 70% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	236	246
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	236	246
Agricultural Mortgage Loans \| 50% - 70% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	426	379
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	426	379
Agricultural Mortgage Loans \| 50% - 70% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	251	224
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	251	224
Agricultural Mortgage Loans \| 50% - 70% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	33	31
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	33	31
Agricultural Mortgage Loans \| 70% - 90%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	19	46
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	19	46
Agricultural Mortgage Loans \| 70% - 90% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 70% - 90% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	19	19
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	19	19
Agricultural Mortgage Loans \| 70% - 90% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	27
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	27
Agricultural Mortgage Loans \| 70% - 90% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Agricultural Mortgage Loans \| 90% plus \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	0	0
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	0	0
Total Mortgages Loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	12,090	11,825
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	124	95
Current	11,966	11,730
Total Financing Receivables	12,090	11,825
Recorded Investment 90 Days or More and Accruing	66	40
Total Mortgages Loan \| 30-59 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	57	18
Total Mortgages Loan \| 60-89 Days
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1	8
Total Mortgages Loan \| 90 Days Or Greater
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	66	69
Total Mortgages Loan \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	5,639	6,342
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	5,639	6,342
Total Mortgages Loan \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,522	870
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,522	870
Total Mortgages Loan \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	2,023	2,023
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	2,023	2,023
Total Mortgages Loan \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,963	1,687
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,963	1,687
Total Mortgages Loan \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	860	821
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	860	821
Total Mortgages Loan \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	83	82
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	83	82
Total Mortgages Loan \| 0% - 50%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	2,746	2,683
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	2,746	2,683
Total Mortgages Loan \| 0% - 50% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,209	1,062
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,209	1,062
Total Mortgages Loan \| 0% - 50% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	142	168
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	142	168
Total Mortgages Loan \| 0% - 50% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	455	514
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	455	514
Total Mortgages Loan \| 0% - 50% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	569	567
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	569	567
Total Mortgages Loan \| 0% - 50% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	321	321
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	321	321
Total Mortgages Loan \| 0% - 50% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	50	51
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	50	51
Total Mortgages Loan \| 50% - 70%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	8,562	8,224
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	8,562	8,224
Total Mortgages Loan \| 50% - 70% \| Greater than 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	4,179	5,020
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	4,179	5,020
Total Mortgages Loan \| 50% - 70% \| 1.8x to 2.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,282	702
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,282	702
Total Mortgages Loan \| 50% - 70% \| 1.5x to 1.8x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,354	1,392
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,354	1,392
Total Mortgages Loan \| 50% - 70% \| 1.2x to 1.5x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	1,221	704
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	1,221	704
Total Mortgages Loan \| 50% - 70% \| 1.0x to 1.2x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	493	375
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	493	375
Total Mortgages Loan \| 50% - 70% \| Less than 1.0x
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	33	31
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	33	31
Total Mortgages Loan \| 70% - 90%
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Face amount of mortgage loans	782	891
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Financing Receivables	782	891

INVESTMENTS - Mortgage Loans by Loan-to-Value with Debt Service Coverage Ratios and Age Analysis of Past Due Mortgage Loans (Details) - USD ($)
$ in Millions