Debt And Lines Of Credit Debt and Lines of Credit (Summary of Long-Term Debt Parenthetical) (Details) (USD $)				12 Months Ended																				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2007	Dec. 31, 2013 Variable Rate [Domain]		Dec. 31, 2012 Variable Rate [Domain]		Dec. 31, 2013 Six Point Zero Percentage Notes Due Two Thousand And Forty One [Member]	Dec. 31, 2012 Six Point Zero Percentage Notes Due Two Thousand And Forty One [Member]	Dec. 31, 2013 Municipal Bonds [Member]		Dec. 31, 2012 Municipal Bonds [Member]		Dec. 31, 2013 Short-term Debt [Member]	Dec. 31, 2012 Short-term Debt [Member]	Dec. 31, 2013 Foreign Corporate Debt Securities [Member]	Dec. 31, 2012 Foreign Corporate Debt Securities [Member]	Dec. 31, 2013 Long-term Debt [Member]		Dec. 31, 2012 Long-term Debt [Member]		Dec. 31, 2013 Five Point Two Five Percentage To Five Point Five Percentage Notes Due Two Thousand Fourteen To Two Thousand Sixteen [Member]	Dec. 31, 2012 Five Point Two Five Percentage To Five Point Five Percentage Notes Due Two Thousand Fourteen To Two Thousand Sixteen [Member]	Dec. 31, 2013 Four Point Seven Five Percentage Notes Due Two Thousand And Twenty Two [Member]	Dec. 31, 2012 Four Point Seven Five Percentage Notes Due Two Thousand And Twenty Two [Member]	Dec. 31, 2013 Interest Rate Swap Unwind [Member] Long-term Debt [Member]	Dec. 31, 2012 Interest Rate Swap Unwind [Member] Long-term Debt [Member]
Debt Instrument [Line Items]
Long Term Debt, Maturity Date								2041	2041															2022	2022
Debt instrument, interest rate during period				2.60%		2.60%				5.50%		5.60%		2.80%	2.20%	5.80%	5.60%
Long-term debt			$ 2,140,000,000	$ 269,000,000	[1]	$ 314,000,000	[1]	$ 585,000,000	$ 585,000,000	$ 1,487,000,000	[2]	$ 1,812,000,000	[2]			$ 93,000,000	$ 29,000,000	$ 304,000,000	[3]	$ 331,000,000	[3]	$ 657,000,000	$ 701,000,000	$ 899,000,000	$ 899,000,000
Deferred gain (loss) on discontinuation of interest rate fair value hedge																										41,000,000	61,000,000
Debt Instrument, Fair Value Disclosure	$ 10,700,000,000	$ 12,300,000,000

[1] The weighted average interest rate on these notes was 2.6% in 2013 and 2.6% in 2012.

[2] The weighted average interest rate on these bonds was 5.5% in 2013 and 5.6% in 2012.

[3] Includes $41 million at December 31, 2013 and $61 million at December 31, 2012, related to the unamortized gain on interest rate swap unwinds (see Note 14).