CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
OPERATING ACTIVITIES
Net income	$ 298	$ 200
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,117	1,208
Deferred income taxes	166	115
Provision for uncollectible accounts	27	56
(Gain) loss on intangible assets	(32)
Long-term debt (premium) discount amortization	(16)	(28)
Net (gain) on early retirement of debt		(8)
Changes in current assets and current liabilities:
Accounts receivable	(34)	18
Accounts payable	(34)	(198)
Accrued income and other taxes	76	80
Other current assets and other current liabilities, net	(37)	156
Retirement benefits	(178)	(75)
Changes in other noncurrent assets and liabilities	14	47
Other, net	20	12
Net cash provided by operating activities	1,387	1,583
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(663)	(678)
Proceeds from sale of intangible assets	75
Other, net	4	15
Net cash used in investing activities	(584)	(663)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	988	2,032
Payments of long-term debt	(56)	(849)
Net borrowings (payments) on credit facility	(745)	(277)
Dividends paid	(341)	(452)
Net proceeds from issuance of common stock	13	35
Repurchase of common stock	(397)	(11)
Other, net		3
Net cash (used in) provided by financing activities	(538)	481
Effect of exchange rate changes on cash and cash equivalents		1
Net increase in cash and cash equivalents	265	1,402
Cash and cash equivalents at beginning of period	211	128
Cash and cash equivalents at end of period	476	1,530
Supplemental cash flow information:
Income taxes (paid), net	(8)	(1)
Interest (paid) (net of capitalized interest of $9 and $9)	$ (265)	$ (244)