Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - Commercial Paper Program (Details) - USD ($)	3 Months Ended
Debt - Commercial Paper Program (Details) - USD ($)	Mar. 31, 2021	Mar. 31, 2020	Apr. 30, 2021	Dec. 31, 2020	Sep. 30, 2019
Debt Instrument
Weighted-average interest rate (as a percent)	0.26%			0.30%
Debt instrument, term	1 month	1 month
Commercial Paper Program
Debt Instrument
Maximum outstanding amount capacity					$ 1,000,000,000.0
Borrowings	$ 928,000,000			$ 130,000,000
Commercial Paper Program \| Subsequent Event
Debt Instrument
Maximum outstanding amount capacity			$ 1,250,000,000