Debt - Credit Facility (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Line of credit facility, fair value of amount outstanding		$ 0	$ 0
Liens on Brazilian assets		0	$ 0
Commercial paper and credit facility maximum borrowing capacity	$ 1,800,000,000
Commercial paper	$ 0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, accordion feature		750,000,000
Debt guaranteed by domestic subsidiary		$ 100,000,000
Line of credit facility, commitment fee (percent)		0.25%
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Line of credit facility, interest rate, base rate (percent)		0.00%
Line of credit facility, interest rate, LIBOR plus all-in spread rate		1.00%
All-in interest rate spread based on credit rating (percent)		0.375%
Line of credit facility, commitment fee (percent)		0.125%
Line of credit facility, covenant terms		3.00x
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Line of credit facility, interest rate, base rate (percent)		0.70%
Line of credit facility, interest rate, LIBOR plus all-in spread rate		1.70%
All-in interest rate spread based on credit rating (percent)		1.375%
Line of credit facility, commitment fee (percent)		0.30%
Line of credit facility, covenant terms		4.25x
Current Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, current borrowing capacity		$ 1,800,000,000
Letter of credit, credit facility sub-facility, maximum borrowing amount		250,000,000
Previous Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, former borrowing capacity		$ 2,000,000,000.0