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Indebtedness divided by net capital.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Financing Arrangements - Narrative (Details)									3 Months Ended		22 Months Ended
Financing Arrangements - Narrative (Details)	Apr. 27, 2020 USD ($)	Feb. 21, 2020 EUR (€)	Aug. 09, 2019 USD ($)	Mar. 01, 2019 USD ($)	Feb. 27, 2019 EUR (€)	Feb. 27, 2019 USD ($)	Feb. 26, 2019 USD ($)	Sep. 27, 2017	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Aug. 06, 2019 USD ($)	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 BRL (R$)	Mar. 31, 2020 USD ($)	Mar. 13, 2020 USD ($)	Mar. 12, 2020 EUR (€)	Mar. 12, 2020 USD ($)	Feb. 21, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 05, 2019 EUR (€)
Debt Instrument [Line Items]
Repayments of long-term debt									$ 566,000,000	$ 939,000,000
Letter of Credit Subfacility Maturing 2022
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity												₨ 1,000,000,000	R$ 1,000,000,000	$ 206,000,000					$ 262,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity														$ 3,500,000,000
Line of Credit \| Foreign Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity \| €																				€ 250,000,000
0.50% notes maturing 2028 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		€ 500,000,000																$ 540,000,000
Debt instrument, interest rate, stated percentage		0.50%																0.50%
Debt instrument, redemption price, percentage		101.00%
101% notes maturing 2029 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount							$ 700,000,000			$ 700,000,000
Debt instrument, interest rate, stated percentage							4.75%
Debt instrument, redemption price, percentage							101.00%
Senior note - 0.625%
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage												0.625%	0.625%	0.625%
Senior note - 0.625% \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount																€ 500,000,000	$ 566,000,000
Debt instrument, interest rate, stated percentage																0.625%	0.625%
Term Loan Agreement \| Secured Debt
Debt Instrument [Line Items]
Repayments of long-term debt			$ 1,000,000,000.0		€ 600,000,000	$ 673,000,000
Senior note - 2.4% maturing 2019
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.40%
Repayments of long-term debt				$ 250,000,000
364-Day Credit Agreement \| Line of Credit \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.40%
Ratio of indebtedness to net capital	0.65
Debt instrument, covenant, rolling twelve month coverage ratio, minimum	3.0
Line of credit facility, maximum borrowing capacity	$ 500,000,000
364-Day Credit Agreement \| Line of Credit \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.625%
364-Day Credit Agreement \| Line of Credit \| Prime Rate \| Revolving Credit Facility \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.625%
Third Amended and Restated Long-Term Credit Agreement \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage								0.10%
Ratio of indebtedness to net capital								0.65
Debt instrument, covenant, rolling twelve month coverage ratio, minimum								3.0
Line of credit facility, maximum borrowing capacity											$ 3,500,000,000			$ 3,500,000,000	$ 2,200,000,000
Line of credit facility, increase											$ 500,000,000
Line of credit outstanding														2,200,000,000					0
Line of credit remaining availability														1,300,000,000
Third Amended and Restated Long-Term Credit Agreement \| Line of Credit \| London Interbank Offered Rate (LIBOR) \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								1.125%
Third Amended and Restated Long-Term Credit Agreement \| Line of Credit \| Prime Rate \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate								0.125%
Accounts Receivable
Debt Instrument [Line Items]
Outstanding accounts receivable transferred under arrangements where the Company continues to service the transferred asset														$ 241,000,000					$ 348,000,000