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Redeemable Noncontrolling Interests (Narrative) (Details) - USD ($)
12 Months Ended
Nov. 18, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2013
Noncontrolling Interest [Line Items]          
Payments to Noncontrolling Interests $ 588,000,000 $ 588,000,000 $ 0 $ 0  
Historical adjustments to carrying value of the redeemable noncontrolling interest 128,000,000        
Redeemable Noncontrolling Interest, Equity, Carrying Amount 263,000,000        
Purchase price in excess of carrying value 324,000,000        
Transaction costs charged to additional paid-in capital 4,000,000        
RGNext [Member]          
Noncontrolling Interest [Line Items]          
Noncontrolling Interest, Ownership Percentage Acquired by Parent   10.00%      
Noncontrolling Interest, Ownership Percentage by Parent   60.00%     50.00%
AOCI Attributable to Parent [Member]          
Noncontrolling Interest [Line Items]          
Purchase price in excess of carrying value $ 1,000,000