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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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