Long-Term Debt and Short-Term Borrowings - Short-Term Borrowings and Current Portion of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Long-Term Debt
Total long-term debt	$ 19,359	$ 14,156
Short-Term Borrowings and Current Portion of Long-Term Debt
Short-term borrowings and current portion of long-term debt	$ 2,795	1,211
Japan subsidiary credit facility
Long-Term Debt
Interest rate - effective	0.13%
Short-Term Borrowings and Current Portion of Long-Term Debt
Short-term borrowings and current portion of long-term debt	$ 632
Germany subsidiary credit facility
Long-Term Debt
Interest rate - effective	0.25%
Short-Term Borrowings and Current Portion of Long-Term Debt
Short-term borrowings and current portion of long-term debt	$ 168
Current portion of long-term debt
Long-Term Debt
Interest rate - effective	3.85%
Total long-term debt	$ 1,841	745
Commercial paper
Long-Term Debt
Interest rate - effective	1.61%
Short-Term Borrowings and Current Portion of Long-Term Debt
Short-term borrowings and current portion of long-term debt	$ 150	435
Other borrowings
Long-Term Debt
Interest rate - effective	4.85%
Short-Term Borrowings and Current Portion of Long-Term Debt
Short-term borrowings and current portion of long-term debt	$ 4	$ 31