Principal amount of transferred financial assets in which the transferor has continuing involvement with the assets underlying the transaction. Continuing involvement includes, but is not limited to, servicing, recourse, and restrictions on transferor's interests in transferred financial assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Financing Arrangements - Narrative (Details)						6 Months Ended
Financing Arrangements - Narrative (Details)	Jun. 15, 2021 USD ($)	May 07, 2020 USD ($)	Mar. 13, 2020 USD ($)	Feb. 21, 2020 USD ($)	Sep. 27, 2017	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Apr. 29, 2021 USD ($)	Apr. 26, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 27, 2020 USD ($)	Mar. 12, 2020 USD ($)	Mar. 12, 2020 EUR (€)	Feb. 21, 2020 EUR (€)	Aug. 06, 2019 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings						$ 5,001,000,000				$ 5,059,000,000
Repayments of long-term debt						300,000,000	$ 568,000,000
Amounts borrowed under line of credit						300,000,000	1,029,000,000
Letter of Credit Subfacility Maturing 2022
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						213,000,000				206,000,000
2.400% notes maturing 2031 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount								$ 300,000,000
Debt instrument, interest rate, stated percentage								2.40%
4.850% notes maturing 2021 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	4.85%
Maturity and repayment of senior note	$ 300,000,000
4.850% notes maturing 2021 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount									$ 300,000,000
Debt instrument, interest rate, stated percentage									4.85%
4.60% notes maturing 2050 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 500,000,000
Debt instrument, interest rate, stated percentage		4.60%
Debt instrument, redemption price, percentage		101.00%
0.50% notes maturing 2028 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 540,000,000										€ 500,000,000
Debt instrument, interest rate, stated percentage				0.50%										0.50%
Debt instrument, redemption price, percentage				101.00%
0.625% notes maturing 2020 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount												$ 566,000,000	€ 500,000,000
Debt instrument, interest rate, stated percentage												0.625%	0.625%
364-Day Credit Agreement \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity											$ 500,000,000
Outstanding borrowings									$ 0
Repayments of long-term debt			$ 500,000,000
Third Amended and Restated Long-Term Credit Agreement \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			2,200,000,000												$ 3,500,000,000
Line of credit facility, commitment fee percentage					0.10%
Ratio of indebtedness to net capital					0.65
Minimum coverage ration for debt covenant					3.0
Repayments of long-term debt			$ 500,000,000
Amounts borrowed under line of credit						0
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]
Proceeds from sale of receivables under arrangements						0	$ 475,000,000
Outstanding receivables transferred under arrangements						$ 0				$ 30,000,000