Fair Value (Fair Value of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value of Financial Instruments [Line Items]
Notes Receivable, Excluding Capital Leases	$ 46	$ 41
Dividends payable	238	116
Short-term Debt	511	131
Long-term Debt, excluding capital leases	8,030	8,094
Fair Value, Inputs, Level 1 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, excluding capital leases, Fair Value	0	0
Dividends Payable Fair Value	238	116
Short-term Debt, Fair Value	0	0
Long-term Debt, excluding capital leases, Fair Value	483	425
Fair Value, Inputs, Level 2 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, excluding capital leases, Fair Value	0	0
Dividends Payable Fair Value	0	0
Short-term Debt, Fair Value	511	131
Long-term Debt, excluding capital leases, Fair Value	7,511	7,551
Fair Value, Inputs, Level 3 [Member]
Fair Value of Financial Instruments [Line Items]
Notes Receivable, excluding capital leases, Fair Value	46	41
Dividends Payable Fair Value	0	0
Short-term Debt, Fair Value	0	0
Long-term Debt, excluding capital leases, Fair Value	$ 801	$ 499