Income Tax (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Tax Examination, Penalties Expense	$ 0	$ 0	$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	18,000,000
Current income tax payable	57,000,000	110,000,000
MetLife, Inc.
Income Taxes Paid	73,000,000	0	$ 2,000,000
Current income tax payable	$ 68,000,000	$ 121,000,000