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Basis of Presentation and Summary of Significant Accounting Policies Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Contract liabilities $ 572 $ 507
Contract with Customer, Liability, Noncurrent 67 $ 80
Revenue recognized that was included in contract liabilities 323  
Remaining performance obligations $ 3,500