Dispositions - Separation of Brighthouse - Agreements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Liabilities	$ 24,179	$ 22,964
Net cash paid (received) for Income tax	1,099	1,935	$ 1,530
Increase (Decrease) in Income Taxes Payable	233	940	(2,796)
Other Assets	10,518	8,408
Taxes Payable, Current	363	441
Brighthouse Financial, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Decrease to current income tax recoverable			$ 1,093
Brighthouse Financial, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Assets	330	330
Possible Change in Tax Assessment | Brighthouse Financial, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other Liabilities	45	43
Increase (Decrease) in Income Taxes Payable	70	68
Other Assets	115	111
Taxes Payable, Current	$ 115	$ 111