Receivables, net - Contractual Maturities by Repricing Characteristic (Details) $ in Millions	Dec. 31, 2015 USD ($)
Receivables [Abstract]
Receivables at predetermined interest rates, over 1 but within 5 years	$ 395
Receivables at floating or adjustable rates, over 1 but within 5 years	61
Total, over 1 but within 5 years	456
Receivables at predetermined interest rates, over 5 years	7,866
Receivables at floating or adjustable rates, over five years	804
Total, over 5 years	$ 8,670