Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Adoption of New Accounting Standard Current Expected Credit Losses	$ 14		$ 0		$ 0
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	236		181		227
Valuation Allowances and Reserves, Charged to Cost and Expense	(4)		(56)		(34)
Valuation Allowances and Reserves, Charged to Other Accounts	(19)		(1)		(12)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	0		0		0
Valuation Allowances and Reserves, Balance, Ending Balance	251		236		181
SEC Schedule, 12-09, Allowance, Loan and Lease Loss, Real Estate [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	12	[1]	11		9
Valuation Allowances and Reserves, Charged to Cost and Expense	(38)	[1]	(1)		(2)
Valuation Allowances and Reserves, Charged to Other Accounts	(14)	[1]	0		0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	0	[1]	0		0
Valuation Allowances and Reserves, Balance, Ending Balance	64	[1]	12	[1]	$ 11
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Valuation Allowances and Reserves, Balance, Beginning Balance	0
Valuation Allowances and Reserves, Charged to Cost and Expense	(41)
Valuation Allowances and Reserves, Charged to Other Accounts	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction	21
Valuation Allowances and Reserves, Balance, Ending Balance	$ 20		$ 0

[1] Upon adoption of Financial Instruments – Credits Losses on January 1, 2020, the Company increased the valuation allowance for mortgage loans by $14 million. The increase was reflected as a decrease to opening retained earnings, net of income taxes.