Condensed Consolidated Statements Of Cash Flows (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Condensed Consolidated Statements Of Cash Flows
Net Cash Provided by Operating Activities	$ 571	$ 1,076
Cash Flow from Investing Activities:
Capital expenditures	(577)	(670)
Net (increase) decrease in short-term investments	(531)	(641)
Net (increase) decrease in restricted cash and short-term investments	(7)	(1)
Proceeds from sale of equipment and property	(13)	(7)
Cash collateral on spare parts financing
Net cash provided by (used for) investing activities	(1,128)	(1,319)
Cash Flow from Financing Activities:
Payments on long-term debt and capital lease obligations	(1,013)	(351)
Proceeds from:
Issuance of debt and sale leaseback transactions	1,792	687
Reimbursement from construction reserve account		1
Funds transferred to affiliates, net	(74)	(51)
Net cash provided by (used for) financing activities	705	286
Net increase (decrease) in cash	148	43
Cash at beginning of period	165	149
Cash at end of period	$ 313	$ 192

Funds transferred to affiliates, net.

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The net cash inflow (outflow) for the net change associated with funds and investments that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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Payment of cash collateral on spare parts financing.

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Proceeds from Issuance of Debt and Sale Lease back Transactions.

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Abstract.

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Reimbursement from construction reserve account.

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The cash outflow for debt and for leases meeting the criteria for capitalization, initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

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The net change between the beginning and ending balance of cash and cash equivalents.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The net cash inflow (outflow) from financing activity for the period.

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-Name Statement of Financial Accounting Standard (FAS)
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The net cash inflow (outflow) from investing activity.

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-Number 95
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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The net amount paid (received) by the reporting entity through acquisition (sale/maturities) of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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