Debt - Credit Facilties and Committed Liquidity Programs (Details) € in Millions, £ in Millions, $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 GBP (£)	Dec. 31, 2019 USD ($)
Schedule Of Debt [Line Items]
ABS Liquidity	$ 128	€ 104
Discontinued Hedged Debt	299			$ 7
FCE Bank plc [Member]
Schedule Of Debt [Line Items]
Debt Covenant Minimum Net Worth Requirement	500
Unsecured Debt [Member]
Schedule Of Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,500
Borrowing availability	2,000
Syndicated Credit Facility [Member] | FCE Bank plc [Member]
Schedule Of Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,066		£ 780
Borrowing availability | £			780
Syndicated Credit Facility [Member] | FCE Bank plc [Member] | 2022 [Member]
Schedule Of Debt [Line Items]
Borrowing availability | £			£ 95
Syndicated Credit Facility [Member] | Ford Bank [Member] [Member]
Schedule Of Debt [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	294	240
Borrowing availability | €		€ 240
Contractually Committed Liquidity Facilities [Member]
Schedule Of Debt [Line Items]
Commitment To Sell Commercial Paper Conduits Maximum	38,100
Commitment To Sell Commercial Paper Conduits Current	16,800
Commitment To Sell Commercial Paper Conduits Utilized	16,700
Operating Lease [Member] | Contractually Committed Liquidity Facilities [Member]
Schedule Of Debt [Line Items]
Commitment To Sell Commercial Paper Conduits Maximum	11,100
Retail [Member] | Contractually Committed Liquidity Facilities [Member]
Schedule Of Debt [Line Items]
Commitment To Sell Commercial Paper Conduits Maximum	22,200
Wholesale [Member] | Contractually Committed Liquidity Facilities [Member]
Schedule Of Debt [Line Items]
Commitment To Sell Commercial Paper Conduits Maximum	$ 4,800