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Accumulated Other Comprehensive Income (Loss) - Narrative (Details) $ in Millions	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 EUR (€)	May 31, 2015 EUR (€)	May 31, 2014 EUR (€)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative translation adjustment losses, net of tax	$ 1,300		$ 1,500
Unrecognized pension and other postretirement benefits costs, net of tax	309		$ 371
Net Investment Hedging | Euro Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income related to net investment hedge unrealized gain (loss), before tax	9	$ (120)
Euro Notes Issued May 2014 | Net Investment Hedging | Euro Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Face value of notes | €						€ 1,000,000,000.0
Long-term debt	1,200
Euro Notes Issued May 2015 | Net Investment Hedging | Euro Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Face value of notes | €					€ 1,000,000,000.0
Long-term debt	1,200
Euro Notes Issued June 2019 | Net Investment Hedging | Euro Notes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Face value of notes | €				€ 1,600,000,000
Long-term debt	$ 1,900

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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