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Condensed Consolidated Statements of Cash Flows
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Operating Activities      
Net income $ 1,570 $ 2,606 $ 2,961
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 551 1,098 1,100
Deferred and other income taxes   171 209
Other operating activities, net   (9) 41
Changes in current assets and liabilities:      
Accounts receivable, net   207 (54)
Materials and supplies   83 (33)
Other current assets   (36) (85)
Accounts payable and other current liabilities   (197) (185)
Income and other taxes   469 (54)
Cash provided by operating activities   4,392 3,900
Investing Activities      
Capital investments   (1,599) (1,560)
Proceeds from asset sales   107 30
Maturities of short-term investments (Note 13)   75 105
Purchases of short-term investments (Note 13)   (75) (100)
Other investing activities, net   75 (85)
Cash used in investing activities   (1,417) (1,610)
Financing Activities      
Debt issued (Note 14)   4,004 2,992
Share repurchase programs (Note 18)   (2,556) (3,629)
Dividends paid   (1,319) (1,248)
Debt repaid   (770) (604)
Net issuance/(repayment) of commercial paper (Note 14)   (1) 471
Other financing activities, net   (65) (29)
Cash used in financing activities   (1,107) (2,547)
Net change in cash, cash equivalents, and restricted cash   1,868 (257)
Cash, cash equivalents, restricted cash, beginning balance   856 1,328
Cash, cash equivalents, restricted cash, ending balance 1,071 2,724 1,071
Non-cash investing and financing activities:      
Capital investments accrued but not yet paid   141 136
Common shares repurchased but not yet paid 19   19
Cash (paid for)/received from:      
Income taxes, net of refunds   (158) (717)
Interest, net of amounts capitalized   (489) (504)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position      
Cash and cash equivalents, at carry value 1,049 2,706 1,049
Cash, cash equivalents, restricted cash, ending balance 1,071 2,724 1,071
Accelerated Share Repurchase Agreement [Member]      
Financing Activities      
Share repurchase programs (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 10 6 10
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 $ 12