Debt Key Components of Long-term Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Fair Value Inputs, Discount Rate	1.00%
Long-term Debt	$ 5,494	$ 5,494
Long-term Notes $2.5B
Debt Instrument [Line Items]
Fair Value Inputs, Discount Rate	99.943%
Long-term Debt	2,499
Long-term Notes $2.0B
Debt Instrument [Line Items]
Fair Value Inputs, Discount Rate	99.76%
Long-term Debt	1,996
Long-term Notes $1.0B
Debt Instrument [Line Items]
Fair Value Inputs, Discount Rate	99.925%
Long-term Debt	999
Long-term Notes $5.5B
Debt Instrument [Line Items]
Long-term Debt	$ 5,494