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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating Activities    
Net income $ 1,474 $ 1,391
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 547 549
Deferred and other income taxes 91 103
Other operating activities, net (64) (53)
Changes in current assets and liabilities:    
Accounts receivable, net (74) 83
Materials and supplies 59 (38)
Other current assets 1 (57)
Accounts payable and other current liabilities (168) (259)
Income and other taxes 289 240
Cash provided by operating activities 2,155 1,959
Investing Activities    
Capital investments (807) (752)
Maturities of short-term investments (Note 13) 70 90
Purchases of short-term investments (Note 13) (70) (90)
Proceeds from asset sales 8 14
Other investing activities, net (8) (46)
Cash used in investing activities (807) (784)
Financing Activities    
Debt issued (Note 14) 2,996 2,992
Common share repurchases (Note 18) (2,556) (2,987)
Dividends paid (660) (626)
Debt repaid (305) (560)
Net issuance/(repayment) of commercial paper (Note 14) (1) 299
Other financing activities, net (71) (23)
Cash used in financing activities (997) (1,405)
Net change in cash, cash equivalents, and restricted cash 351 (230)
Cash, cash equivalents, restricted cash, beginning balance 856 1,328
Cash, cash equivalents, restricted cash, ending balance 1,207 1,098
Non-cash investing and financing activities:    
Capital investments accrued but not yet paid 169 149
Common shares repurchased but not yet paid   22
Cash (paid for)/received from:    
Income taxes, net of refunds (11) (1)
Interest, net of amounts capitalized (349) (356)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position    
Cash and cash equivalents, at carry value 1,130 1,059
Cash, cash equivalents, restricted cash, ending balance 1,207 1,098
Accelerated Share Repurchase Agreement [Member]    
Financing Activities    
Common share repurchases (Note 18) (400) (500)
Other Current Assets [Member]    
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position    
Restricted Cash and Cash Equivalents 65 27
Other Noncurrent Assets [Member]    
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position    
Restricted Cash and Cash Equivalents $ 12 $ 12