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Contingencies (Guarantees and Other Similar Matters Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Contingent liability related to performance surety bonds $ 30,000,000  
Redeemable noncontrolling interest 38,000,000 $ 39,000,000
Letter of Credit [Member]    
Loss Contingencies [Line Items]    
Credit line available under the agreement 52,000,000  
Revolving Credit Facility [Member] | Credit Agreement [Member]    
Loss Contingencies [Line Items]    
Credit line available under the agreement $ 3,000,000,000.0  
Debt instrument, term 5 years