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Significant Accounting Policies (Narrative) (Details)		3 Months Ended	12 Months Ended
	Jan. 01, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment business_unit	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Jan. 01, 2021 segment
Finite-Lived Intangible Assets [Line Items]
Core business segments, number | segment			2	3		2
Goodwill impairment		$ 62,000,000	$ 0	$ 99,000,000	$ 0
Intangible assets			$ 708,000,000	683,000,000
Period in years that unrecognized actuarial net gains (losses) are being recognized			22 years
Period of recognition (no greater than)			5 years
Retained earnings			$ 1,260,000,000	1,305,000,000
Adjustment
Finite-Lived Intangible Assets [Line Items]
Retained earnings	$ (3,000,000)
Tax	$ 1,000,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets useful lives			1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Finite lived intangible assets useful lives			25 years
Government Solutions
Finite-Lived Intangible Assets [Line Items]
Number of business units | business_unit			4
Goodwill impairment				$ 0

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