Borrowings and Other Obligations (Schedule of Short-term Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Other Short-term Financing Arrangements	$ 211	$ 13
Short-term Borrowings	211	13
Long-term Debt and Lease Obligation	2,431	2,601
Senior Notes
Short-term Debt [Line Items]
Long-term Debt	1,898	2,098
Other short-term bank loans
Short-term Debt [Line Items]
Finance Lease, Liability, Noncurrent	45	48
Secured Debt
Short-term Debt [Line Items]
Long-term Debt	488	0
Other Long-term Debt	0	455
Other short-term bank loans
Short-term Debt [Line Items]
Current Portion of Exit Notes and Finance Lease	211	9
Other Short-term Financing Arrangements	$ 0	$ 4