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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Activities    
Net income $ 1,341 $ 1,474
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation 549 547
Deferred and other income taxes 54 91
Other operating activities, net (131) (64)
Changes in current assets and liabilities:    
Accounts receivable, net (105) (74)
Materials and supplies (21) 59
Other current assets (1) 1
Accounts payable and other current liabilities (67) (168)
Income and other taxes 339 289
Cash provided by operating activities 1,958 2,155
Investing Activities    
Capital investments (536) (807)
Maturities of short-term investments (Note 12) 24 70
Purchases of short-term investments (Note 12) (24) (70)
Proceeds from asset sales 17 8
Other investing activities, net 14 (8)
Cash used in investing activities (505) (807)
Financing Activities    
Share repurchase programs (Note 15) (1,347) (2,556)
Dividends paid (650) (660)
Debt repaid (47) (305)
Net issuance/(repayment) of commercial paper (Note 13) (15) (1)
Debt issued (Note 13)   2,996
Other financing activities, net (14) (71)
Cash used in financing activities (2,073) (997)
Net change in cash, cash equivalents, and restricted cash (620) 351
Cash, cash equivalents, restricted cash, beginning balance 1,818 856
Cash, cash equivalents, restricted cash, ending balance 1,198 1,207
Non-cash investing and financing activities:    
Capital investments accrued but not yet paid 99 169
Common shares repurchased but not yet paid 55  
Cash (paid for)/received from:    
Income taxes, net of refunds (1) (11)
Interest, net of amounts capitalized (394) (349)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position    
Cash and cash equivalents, at carry value 1,183 1,130
Cash, cash equivalents, restricted cash, ending balance 1,198 1,207
Accelerated Share Repurchase Agreement [Member]    
Financing Activities    
Share repurchase programs (Note 15)   (400)
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 3 65
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