Commitments and Contingencies - Guarantees (Details) $ in Millions	Mar. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	$ 320
Recorded Liability for Guarantees	114
Debt service
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	116
Recorded Liability for Guarantees	15
Operating profit
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	195
Recorded Liability for Guarantees	98
Other
Commitments and Contingencies Disclosure [Line Items]
Maximum Potential Amount of Future Fundings	9
Recorded Liability for Guarantees	$ 1