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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating Activities [Abstract]    
Net income $ 2,379 $ 2,063
Adjustments to reconcile net income to cash provided by operating activities [Abstract]    
Depreciation 934 872
Deferred income taxes and unrecognized tax benefits 155 365
Other operating activities, net (43) (83)
Changes in current assets and liabilities [Abstract]    
Accounts receivable, net (252) (137)
Materials and supplies (86) 6
Other current assets (99) (37)
Accounts payable and other current liabilities 233 169
Cash provided by operating activities 3,221 3,218
Investing Activities [Abstract]    
Capital investments (2,068) (1,730)
Proceeds from asset sales 40 42
Other investing activities, net (150) (51)
Cash used in investing activities (2,178) (1,739)
Financing Activities [Abstract]    
Debt issued (Note 15) 1,895 944
Common share repurchases (Note 18) (1,450) (833)
Dividends paid (776) (646)
Debt repaid (640) (139)
Other financing activities, net 33 (23)
Cash used in financing activities (938) (697)
Net change in cash and cash equivalents 105 782
Cash and cash equivalents at beginning of year 1,432 1,063
Cash and cash equivalents at end of period 1,537 1,845
Non-cash investing and financing activities [Abstract]    
Cash dividends declared but not yet paid 404 316
Capital investments accrued but not yet paid 109 119
Common shares repurchased but not yet paid 39 24
Cash paid for: [Abstract]    
Income taxes, net of refunds (1,229) (715)
Interest, net of amounts capitalized $ (231) $ (251)