Summary of Significant Accounting Policies Backlog and Contract Assets and Liabilities (Details 6) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenue, Remaining Performance Obligation, Amount		$ 84,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation		Of our December 31, 2023 backlog, we expect to recognize approximately 40 percent as revenue over the next 12 months and 65 percent as revenue over the next 24 months, with the remainder to be recognized thereafter.
Unbilled Receivables, Current		$ 5,693	$ 5,983
Increase (Decrease) in Contract with Customer, Asset		$ (290)
Percent increase (decrease) in Unbilled Receivables		(5.00%)
Advance payments and billings in excess of costs incurred		$ (4,193)	(3,609)
Amount of decrease (increase) in Contract with Customer, Liability, Current		$ (584)
Percent decrease (increase) in Contract with Customer, Liability, Current		16.00%
Net contract assets		$ 1,500	2,374
Amount of increase (decrease) in net contract assets (liabilities)		$ (874)
Percent increase (decrease) in net contract assets (liabilities)		(37.00%)
Contract with Customer, Liability, Revenue Recognized		$ 3,100	$ 2,400	$ 2,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Backlog Reduction Due to Contract Termination	$ 2,000
Revenue, Remaining Performance Obligation, Amount		$ 84,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-12-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage		40.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Percentage		65.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		24 months