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Condensed Consolidated Statements of Cash Flows
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Operating Activities      
Net income $ 1,555 $ 3,969 $ 4,516
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation 557 1,653 1,657
Deferred and other income taxes   327 297
Other operating activities, net   119 102
Changes in current assets and liabilities:      
Accounts receivable, net   30 105
Materials and supplies   102 (29)
Other current assets   (7) (12)
Accounts payable and other current liabilities   (215) (257)
Income and other taxes   15 (115)
Cash provided by operating activities   5,993 6,264
Investing Activities      
Capital investments   (2,294) (2,495)
Proceeds from asset sales   119 63
Maturities of short-term investments (Note 13)   106 120
Purchases of short-term investments (Note 13)   (106) (110)
Other investing activities, net   94 (85)
Cash used in investing activities   (2,081) (2,507)
Financing Activities      
Debt issued (Note 14)   4,004 3,986
Share repurchase programs (Note 18)   (2,956) (5,162)
Dividends paid   (1,974) (1,925)
Debt repaid   (832) (642)
Debt exchange   (327)  
Net issuance/(repayment) of commercial paper (Note 14)   (2) (5)
Other financing activities, net   (63) (34)
Cash used in financing activities   (2,150) (3,782)
Net change in cash, cash equivalents, and restricted cash   1,762 (25)
Cash, cash equivalents, restricted cash, beginning balance   856 1,328
Cash, cash equivalents, restricted cash, ending balance 1,303 2,618 1,303
Non-cash investing and financing activities:      
Capital investments accrued but not yet paid   152 151
Common shares repurchased but not yet paid 42   42
Cash (paid for)/received from:      
Income taxes, net of refunds   (925) (1,104)
Interest, net of amounts capitalized   (911) (855)
Reconciliation of cash, cash equivalents, and restricted cash to the Condensed Consolidated Statement of Financial Position      
Cash and cash equivalents, at carry value 1,250 2,601 1,250
Cash, cash equivalents, restricted cash, ending balance 1,303 2,618 1,303
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 41 5 41
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