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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
OPERATING ACTIVITIES    
Net income $ 475 $ 314
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,150 1,160
Deferred income taxes 131 105
Provision for uncollectible accounts 27 35
Net (gain) loss on early retirement of debt (8) 79
Share-based compensation 20 69
Changes in current assets and liabilities:    
Accounts receivable 45 60
Accounts payable (93) (115)
Accrued income and other taxes 31 (16)
Other current assets and liabilities, net (272) (366)
Retirement benefits (71) (25)
Changes in other noncurrent assets and liabilities, net 66 (14)
Other, net 24 13
Net cash provided by operating activities 1,525 1,299
INVESTING ACTIVITIES    
Capital expenditures (716) (974)
Proceeds from sale of property, plant and equipment and other assets 35 35
Other, net 6 0
Net cash used in investing activities (675) (939)
FINANCING ACTIVITIES    
Net proceeds from issuance of long-term debt 891 1,237
Payments of long-term debt (1,176) (2,488)
Net (payments of) proceeds from revolving line of credit (150) 1,125
Dividends paid (294) (291)
Other, net (45) (69)
Net cash used in financing activities (774) (486)
Net increase (decrease) in cash, cash equivalents and restricted cash 76 (126)
Cash, cash equivalents and restricted cash at beginning of period 427 1,717
Cash, cash equivalents and restricted cash at end of period 503 1,591
Supplemental cash flow information:    
Income taxes paid, net (21) (6)
Interest paid (net of capitalized interest of $13 and $23) (387) (383)
Cash, cash equivalents and restricted cash:    
Total $ 503 $ 1,591