Acquisitions and Divestitures, Goodwill, and Intangible Assets (Amortization Life of Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2019
Contract and Program Intangible Assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	7 years
Contract and Program Intangible Assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	30 years
Tradenames and Trademarks
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	30 years
Technology and Software | Minimum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	5 years
Technology and Software | Maximum
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	15 years
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Range of Amortization Life	7 years