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Condensed Consolidating Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities $ 971 $ 789
Capital investments (1,008) (943)
Other 13 22
Net cash used in investing activities (995) (921)
Payments on short-term debt   (287)
Payments on long-term debt (1,191) (1,139)
Payments on revolving credit facility (1,122)  
Borrowings under revolving credit facility 1,482  
Proceeds from issuance of long-term debt   1,150
Purchase of treasury stock (25)  
Preferred stock dividend (27) (8)
Other   (26)
Net cash used in financing activities (883) (302)
Increase (decrease) in cash and cash equivalents (907) (434)
Cash and cash equivalents at beginning of year 916 1,423
Cash and cash equivalents at end of period 9 989
Parent Company [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 57 735
Capital investments (12) (30)
Other 4 1
Net cash used in investing activities (8) (29)
Intercompany activities (71) (834)
Payments on short-term debt   (287)
Payments on long-term debt (1,191) (1,139)
Payments on revolving credit facility (1,122)  
Borrowings under revolving credit facility 1,482  
Proceeds from issuance of long-term debt   1,150
Purchase of treasury stock (25)  
Preferred stock dividend (27)  
Other   (27)
Net cash used in financing activities (954) (1,137)
Increase (decrease) in cash and cash equivalents (905) (431)
Cash and cash equivalents at beginning of year 914 1,416
Cash and cash equivalents at end of period 9 985
Guarantors [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities 1,396 933
Capital investments (996) (909)
Other 9 21
Net cash used in investing activities (987) (888)
Intercompany activities (411) (48)
Net cash used in financing activities (411) (48)
Increase (decrease) in cash and cash equivalents (2) (3)
Cash and cash equivalents at beginning of year 2 7
Cash and cash equivalents at end of period   4
Non-Guarantors [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Capital investments   (4)
Net cash used in investing activities   (4)
Intercompany activities   4
Net cash used in financing activities   4
Eliminations [Member]    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash provided by (used in) operating activities (482) (879)
Intercompany activities 482 878
Other   1
Net cash used in financing activities $ 482 $ 879