Debt Obligations Debt Obligations (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Dec. 19, 2013
Debt Instrument [Line Items]
Short-term borrowings	$ 64	$ 34
Long-term debt	3,885	3,320
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	2.43%	2.55%
Long-term debt	1,314	1,087
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.91%	7.21%
Long-term debt	31	33
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	1.98%
Long-term debt	340	0
5% Notes Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	600	600
4.625% Notes Due 2021 [Member] [Member]
Debt Instrument [Line Items]
Long-term debt	500	500
5.875% Notes due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	400	400	400
6.375% Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	700	700	700
Term Loan [Member]
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	51	28
Short-term Debt, Weighted Average Interest Rate	2.43%	2.55%
Other Debt [Member]
Debt Instrument [Line Items]
Short-term borrowings	$ 13	$ 6
Short-term Debt, Weighted Average Interest Rate	6.76%	7.11%