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Debt (Syndicated Credit Agreement) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
Jan. 31, 2015
Dec. 31, 2017
Sep. 05, 2017
Mar. 31, 2015
Syndicated Credit Agreement [Member]          
Debt Instrument [Line Items]          
Face amount or capacity of debt (in millions)   $ 9,155      
Credit agreement - initiation date   Jan. 31, 2015      
Credit agreement - advances outstanding       $ 0 $ 9,155
Ratio of net debt to EBITDA covenant     3.5 to 1    
Syndicated Credit Agreement [Member] | Additional Margin Upon Default [Member]          
Debt Instrument [Line Items]          
Credit agreement - basis spread of variable rate     2.00%    
Loan A [Member]          
Debt Instrument [Line Items]          
Face amount or capacity of debt (in millions)   $ 6,286      
Repayments of Debt $ 4,000        
Credit agreement - advances outstanding       0 6,286
Ratio of net debt to EBITDA covenant     3.5 to 1    
Loan A [Member] | Additional Margin Upon Default [Member]          
Debt Instrument [Line Items]          
Credit agreement - basis spread of variable rate     2.00%    
Loan B [Member]          
Debt Instrument [Line Items]          
Face amount or capacity of debt (in millions)   $ 2,869      
Repayments of Debt $ 1,000        
Credit agreement - advances outstanding       $ 0 $ 2,869
Ratio of net debt to EBITDA covenant     3.5 to 1    
Credit agreement - base rate     Amounts borrowed under the Loan B will be subject to amortization from March 2, 2018, with 25 percent of the aggregate principal amount thereof being payable prior to March 2, 2020, and all remaining principal amount due on March 2, 2020.    
Loan B [Member] | Additional Margin Upon Default [Member]          
Debt Instrument [Line Items]          
Credit agreement - basis spread of variable rate     2.00%