Commitments and Contingencies Guarantees (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Customer Lines Of Credit For Brazilian Subsidiary
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 211,000,000	$ 260,000,000
Guarantee of Indebtedness of Others
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure, undiscounted	1,900,000,000.0	$ 2,000,000,000
Line of Credit
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 43,000,000
Guarantor obligations, term	5 years