CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net income	$ 540	$ 584
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,136	3,297
Impairment of assets	9	32
Deferred income taxes	93	301
Provision for uncollectible accounts	128	110
Net long-term debt premium amortization	(10)	(30)
Share-based compensation	57	62
Changes in current assets and liabilities:
Accounts receivable	(91)	(111)
Accounts payable	(84)	(21)
Accrued income and other taxes	250	38
Other current assets and liabilities, net	123	(130)
Retirement benefits	(134)	(255)
Changes in other noncurrent assets and liabilities, net	(54)	66
Other, net	(7)	(6)
Net cash provided by operating activities	3,956	3,937
INVESTING ACTIVITIES
Payments for property, plant and equipment and capitalized software	(2,039)	(2,113)
Proceeds from sale of property	29	0
Other, net	(12)	0
Net cash used in investing activities	(2,022)	(2,113)
FINANCING ACTIVITIES
Net proceeds from issuance of long-term debt	990	483
Payments of long-term debt	(535)	(162)
Net payments on credit facility and revolving line of credit	(725)	(140)
Dividends paid	(905)	(924)
Net proceeds from issuance of common stock	11	45
Repurchase of common stock	(541)	(558)
Other, net	(2)	(2)
Net cash used in financing activities	(1,707)	(1,258)
Net increase in cash and cash equivalents	227	566
Cash and cash equivalents at beginning of period	128	168
Cash and cash equivalents at end of period	355	734
Supplemental cash flow information:
Income taxes paid, net	(54)	(21)
Interest paid (net of capitalized interest of $41 and $34)	$ (914)	$ (934)