Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss)) (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (710,000,000)	$ 724,000,000	$ 3,491,000,000	$ 839,000,000
Net Investment Income	4,087,000,000	4,693,000,000	7,148,000,000	9,601,000,000
Gain (Loss) on Investments	231,000,000	61,000,000	(57,000,000)	76,000,000
Policyholder Benefits and Claims Incurred, Net	(8,667,000,000)	(9,993,000,000)	(17,689,000,000)	(19,065,000,000)
Policyholder Account Balance, Interest Expense	(1,962,000,000)	(1,515,000,000)	(2,042,000,000)	(3,476,000,000)
Operating Expenses	2,983,000,000	3,390,000,000	6,256,000,000	6,615,000,000
Nonperformance Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net	(110,000,000)	(13,000,000)	75,000,000	(75,000,000)
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	3,000,000	0	4,000,000	(1,000,000)
Gain (Loss) on Investments	(15,000,000)	(17,000,000)	(33,000,000)	(35,000,000)
Policyholder Benefits and Claims Incurred, Net	(14,000,000)	(1,000,000)	(9,000,000)	(2,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	10,000,000	5,000,000	16,000,000	8,000,000
Gain (Loss) on Investments	79,000,000	(4,000,000)	87,000,000	(19,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	1,000,000	1,000,000	2,000,000	2,000,000
Other Comprehensive Income (Loss), before Tax	(979,000,000)	566,000,000	3,146,000,000	553,000,000
Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(12,000,000)	(44,000,000)	96,000,000	(50,000,000)
Foreign Exchange Forward [Member] \| Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax				(43,000,000)
Fixed Maturities [Member] \| Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease)	(1,000,000)		(1,000,000)		$ (1,000,000)
Designated as Hedging Instrument [Member] \| Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(11,000,000)	(37,000,000)	99,000,000
Interest Rate Contract \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	9,000,000	6,000,000	15,000,000	11,000,000
Gain (Loss) on Investments	42,000,000	4,000,000	48,000,000	(2,000,000)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	1,000,000	1,000,000
Other Comprehensive Income (Loss), before Tax	(51,000,000)	(10,000,000)	(64,000,000)	(10,000,000)
Credit forwards [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	(1,000,000)	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	1,000,000	0	0
Currency Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	1,000,000	(1,000,000)	1,000,000	(3,000,000)
Gain (Loss) on Investments	287,000,000	83,000,000	(164,000,000)	108,000,000
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	1,000,000	1,000,000	1,000,000	1,000,000
Other Comprehensive Income (Loss), before Tax	(289,000,000)	(83,000,000)	162,000,000	(106,000,000)
Derivative [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	(14,000,000)	(22,000,000)	(34,000,000)	(38,000,000)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Derivative [Member] \| Interest rate swaps \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	(1,000,000)	(1,000,000)	(12,000,000)	(4,000,000)
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(31,000,000)	(205,000,000)	(743,000,000)	(332,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Derivative [Member] \| Currency Swap [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	(5,000,000)	10,000,000	67,000,000	(20,000,000)
Gain (Loss) on Investments	2,000,000	59,000,000	14,000,000	45,000,000
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Debt Securities [Member] \| Interest rate swaps \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	4,000,000	2,000,000	9,000,000	5,000,000
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(17,000,000)	(206,000,000)	(752,000,000)	(334,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Debt Securities [Member] \| Currency Swap [Member] \| Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	5,000,000	(11,000,000)	(60,000,000)	18,000,000
Gain (Loss) on Investments	(3,000,000)	(54,000,000)	(13,000,000)	(42,000,000)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Foreign Currency Gain (Loss) [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	0	0	0	0
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	(250,000,000)	(90,000,000)	203,000,000	(125,000,000)
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	0	0
Non-derivative [Domain] [Member] \| Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(1,000,000)	(7,000,000)	(3,000,000)	(7,000,000)
Accumulated Other Comprehensive Income (Loss) \| Credit forwards [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(86,000,000)	0	(24,000,000)	0
Accumulated Other Comprehensive Income (Loss) \| Currency Swap [Member] \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(445,000,000)	300,000,000	1,169,000,000	59,000,000
Accumulated Other Comprehensive Income (Loss) \| Interest rate swaps \| Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), before Tax	(108,000,000)	358,000,000	1,903,000,000	610,000,000
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1,289,000,000)	745,000,000	4,187,000,000	548,000,000
Net Investment Income	(2,000,000)	(1,000,000)	(6,000,000)	(2,000,000)
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(81,000,000)	(22,000,000)	(167,000,000)	(96,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Foreign Exchange [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(132,000,000)	136,000,000	3,000,000	(6,000,000)
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(1,000,000)	(4,000,000)	(9,000,000)	(1,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Credit derivatives — purchased \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(61,000,000)	(5,000,000)	12,000,000	(20,000,000)
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Credit derivatives — written \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	162,000,000	50,000,000	(149,000,000)	186,000,000
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Equity Market Risk [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(1,043,000,000)	(182,000,000)	516,000,000	(849,000,000)
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(99,000,000)	(30,000,000)	(109,000,000)	(126,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Foreign Currency Gain (Loss) [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(3,000,000)	(111,000,000)	(160,000,000)	(29,000,000)
Net Investment Income	0	0	0	0
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Interest Rate Risk [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	(212,000,000)	857,000,000	3,965,000,000	1,266,000,000
Net Investment Income	(2,000,000)	(1,000,000)	(6,000,000)	(2,000,000)
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(19,000,000)	(12,000,000)	(67,000,000)	(31,000,000)
Policyholder Account Balance, Interest Expense	0	0	0	0
Operating Expenses	0	0	0	0
Net Derivative Gain (Loss) [Member] \| Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	208,000,000	125,000,000	355,000,000	244,000,000
Net Investment Income	69,000,000	60,000,000	146,000,000	116,000,000
Gain (Loss) on Investments	0	0	0	0
Policyholder Benefits and Claims Incurred, Net	(44,000,000)	(33,000,000)	(83,000,000)	(65,000,000)
Policyholder Account Balance, Interest Expense	(38,000,000)	(36,000,000)	(82,000,000)	(68,000,000)
Operating Expenses	0	0	0	0
Other Comprehensive Income (Loss), before Tax	0	0	0	0
Embedded Derivative Financial Instruments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain (Loss) on Derivative, Net	371,000,000	(146,000,000)	(1,051,000,000)	47,000,000
Policyholder Benefits and Claims Incurred, Net	0	0	0	0
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net Investment Income	80,000,000	64,000,000	160,000,000	121,000,000
Gain (Loss) on Investments	64,000,000	(21,000,000)	54,000,000	(54,000,000)
Policyholder Benefits and Claims Incurred, Net	51,000,000	(10,000,000)	(241,000,000)	33,000,000
Policyholder Account Balance, Interest Expense	38,000,000	36,000,000	82,000,000	68,000,000
Operating Expenses	1,000,000	1,000,000	2,000,000	2,000,000
Other Comprehensive Income (Loss), before Tax	$ (991,000,000)	$ 522,000,000	$ 3,242,000,000	$ 503,000,000

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of interest expense for allocation to policyholder account balance.

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Balance Type:	debit
Period Type:	duration