Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 139	$ 134
Adjustments to reconcile net income to net cash flow provided by operating activities
Depreciation and amortization	104	41
Change in derivative instrument assets and liabilities	15	48
Deferred income taxes	0	23
Changes in certain assets and liabilities
Inventories, net of temporary LIFO liquidation	375	278
Receivables, other than energy marketing	119	28
Prepaid taxes	90	26
Energy marketing receivables and trade payables, net	56	107
Trade payables, other than energy marketing	(89)	(23)
Other – net	7	56
Net cash flow provided by operating activities	816	718
Cash flows from investing activities
Expenditures for property, plant and equipment	(171)	(94)
Net cash flow used in investing activities	(171)	(94)
Cash flows from financing activities
Net payments and borrowings of short-term debt	(591)	(707)
Dividends paid on common shares	(42)	(34)
Distribution to noncontrolling interest	(14)	(16)
Payment of senior notes	0	(300)
Payments of term loan facility	0	(150)
Proceeds from term loan facility	0	150
Issuance of senior notes	0	495
Other	4	(1)
Net cash flow used in financing activities	(643)	(563)
Net increase in cash and cash equivalents	2	61
Cash and cash equivalents at beginning of period	69	24
Cash and cash equivalents at end of period	71	85
Cash paid during the period for
Interest	54	36
Income taxes	$ 0	$ 1