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Notes Payable and Long-term Debt (Narrative) (Details) (USD $)
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3 Months Ended | 12 Months Ended | 60 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
lenders
|
Dec. 31, 2011
|
Dec. 31, 2012
lenders
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Dec. 31, 2011
|
Dec. 31, 2010
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Dec. 31, 2017
|
Dec. 31, 2011
Credit Facility Maturing In 2016 [Member]
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Dec. 31, 2011
Notes due 2012, 5.50% [Member]
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Nov. 30, 2010
Aggregate Amount On Principal Amount Due On Two Thousand Twelve [Member]
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Dec. 31, 2012
$1.1B Fixed rate debt [Member]
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Dec. 31, 2011
$1.0B FIxed Rate [Member]
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Dec. 31, 2012
Maximum [Member]
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| Proceeds received from the issuance of debt | $ 1,092,000,000 | $ 992,000,000 | ||||||||||
| Debt Instrument, Face Amount | 1,100,000,000 | 1,000,000,000 | ||||||||||
| Proceeds to exercise rights to call and repurchase long-term debt | 970,000,000 | 0 | 678,000,000 | |||||||||
| Gains (Losses) on Extinguishment of Debt | (29,000,000) | |||||||||||
| Extinguishment of Debt, Gain (Loss), Net of Tax | (19,000,000) | |||||||||||
| Number of highly rated lenders | 25 | 25 | ||||||||||
| Amount of new revolving credit facility | 1,400,000,000 | 1,000,000,000 | 500,000,000 | |||||||||
| Debt Instrument, Basis Spread on Variable Rate | 0.90% | 0.90% | ||||||||||
| Outstanding letters of credit that effectively reduced our borrowing capacity under credit facility | 2,000,000 | 3,000,000 | 2,000,000 | 3,000,000 | ||||||||
| Amounts outstanding under lines of credit | 0.00 | 0.00 | ||||||||||
| Aggregate Maximum Percentage Of Any Single Lender | 10.00% | |||||||||||
| Principal payments due on Long Term Debt for the next 5 years | 0.00 | |||||||||||
| Uncommitted bank lines | 1,400,000,000 | 1,000,000,000 | 500,000,000 | |||||||||
| Maximum total debt to capitalization percentage allowed under credit facility | 60.00% | 60.00% | ||||||||||
| Total debt to capitalization ratio | 36.60% | 36.60% | ||||||||||
| Total payments for interest on notes payable | $ 198,000,000 | $ 167,000,000 | $ 134,000,000 | |||||||||