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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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LONG-TERM DEBT - SCHEDULE OF LONG-TERM DEBT (DETAILS) (USD $) In Millions, unless otherwise specified							3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Fixed-rate notes payable due through 2024 [Member]	Dec. 31, 2012 Fixed-rate notes payable due through 2024 [Member]	Mar. 31, 2013 Variable-rate notes payable due through 2023 [Member]	Dec. 31, 2012 Variable-rate notes payable due through 2023 [Member]	Mar. 31, 2013 Debt prepayments [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 946	$ 1,032	$ 764	$ 844	$ 182	$ 188
Less current portion	106	161
Long-term debt, net of current portion	840	871
Weighted-average fixed-interest rate	5.80%	5.80%
Weighted-average variable-interest rate	1.80%	2.00%
Debt payments							88
Long-term Debt, Fiscal Year Maturity [Abstract]
Remainder of 2013	74
2014	117
2015	113
2016	111
2017	116
Thereafter	415
Long-term Debt	$ 946	$ 1,032	$ 764	$ 844	$ 182	$ 188