Debt (Schedule Of Outstanding Debt) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Feb. 28, 2011
Debt Instrument [Line Items]
Current portion of long-term debt	$ 332	$ 334
Short-term debt	432	334
Long-term debt, current and noncurrent	2,951	2,955
Long-term debt and capital lease obligations	2,619	2,621
Senior Debt Obligations Due 2033 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	297	297
Interest rate	5.875%
Senior Debt Obligations Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	322	323
Interest rate	5.375%		5.375%
Senior Debt Obligations Due 2015 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	230	230
Interest rate	5.75%
Senior Debt Obligations Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	249	249
Interest rate	2.30%
Senior Debt Obligations Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	399	399
Interest rate	9.25%
Senior Debt Obligations Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	497	497
Interest rate	4.80%
Senior Debt Obligations Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	248	248
Interest rate	2.55%
Senior Debt Obligations Due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	247	247
Interest rate	4.05%
Mortgage Due 2035 [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	410	413
Interest rate	5.70%
Three-Year Delayed Draw Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	50	50
Other [Member]
Debt Instrument [Line Items]
Long-term debt, current and noncurrent	2	2
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper	$ 100	$ 0