Fair Value (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Financial Instruments [Line Items]
Notes Receivable Excudling Capital Leases	$ 41	$ 39
Dividends Payable, Current	116	107
Short-term Debt	131	240
Long-term Debt	8,094	7,813
Fair Value, Inputs, Level 1 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, Fair Value Disclosure	0	0
Dividends Payable Fair Value Disclosure	116	107
Short-term Debt, Fair Value Disclosure	0	0
Long-term Debt, Fair Value	425	507
Fair Value, Inputs, Level 2 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, Fair Value Disclosure	0	0
Dividends Payable Fair Value Disclosure	0	0
Short-term Debt, Fair Value Disclosure	131	240
Long-term Debt, Fair Value	7,551	7,453
Fair Value, Inputs, Level 3 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, Fair Value Disclosure	41	39
Dividends Payable Fair Value Disclosure	0	0
Short-term Debt, Fair Value Disclosure	0	0
Long-term Debt, Fair Value	$ 499	$ 933