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Financial Instruments - Narrative (Details) € in Millions, £ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 GBP (£) | Mar. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 GBP (£) | Dec. 31, 2023 EUR (€) | Jun. 30, 2023 GBP (£)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Other investing activities, net |  |  | $ 24 | $ 4 |  |  |  |  |  |
Accumulated other comprehensive earnings (loss) |  | $ (432) | (432) |  |  |  | $ (260) |  |  |
Other financing activities, net | $ 13 |  | 43 | (1) |  |  |  |  |  |
Loss on extinguishment of debt |  |  | 174 | 0 |  |  |  |  |  |
Settlement of net investment hedge cross-currency interest rate swaps |  |  | (5) | 10 |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | 174 |  |  |  |  |  |  |  |
Net Investment Hedges |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative asset fair value |  |  |  |  |  |  | 41 |  |  |
Net Investment Hedges | Senior Notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  |  | € 1,500 |
Net Investment Hedges | Senior Notes | Senior Euro Notes Maturing 2022 to 2039 and ECP Notes |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  | € 1,115 |  |  | 419 |
Interest Rate Swap |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Settlement of net investment hedge cross-currency interest rate swaps |  |  | 5 | $ (10) |  |  |  |  |  |
Interest Rate Swap | Fair Value Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | 1,854 | 1,854 |  | £ 925 | 500 | 1,854 | £ 925 | 500 |
Unamortized fair value basis adjustments |  | 316 | 316 |  |  |  |  |  |  |
Derivative liability fair value |  | (259) | (259) |  |  |  | (594) |  |  |
Fair value of interest expense using amortization approach |  |  | 19 |  |  |  |  |  |  |
Net offset by changes in spot foreign currency exchange rates |  |  | 4 |  |  |  |  |  |  |
Other investing activities, net |  |  | 22 |  |  |  |  |  |  |
Interest Rate Swap | Fair Value Hedging | New Offsetting Variable-to-Fixed Interest Rate Swaps |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  | 1,854 | 1,854 |  | 925 | 500 |  |  |  |
Derivative liability fair value |  | (649) | (649) |  |  |  | 675 |  |  |
Derivative asset fair value |  | 13 | 13 |  |  |  | 12 |  |  |
Interest Rate Swap | Net Investment Hedges |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability fair value |  | 116 | 116 |  |  |  | 240 |  |  |
Derivative asset fair value |  | 38 | 38 |  |  |  | 38 |  |  |
Currency Swap | Fair Value Hedging |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | 170 | 3,375 |  |  |  | £ 925
Fair value of interest expense using amortization approach |  |  | 12 |  |  |  |  |  |  |
Net offset by changes in spot foreign currency exchange rates |  |  | (87) |  |  |  |  |  |  |
Derivative asset fair value |  | 28 | 28 |  |  |  | $ 134 |  |  |
Accumulated other comprehensive earnings (loss) |  | $ 68 | 68 |  |  |  |  |  |  |
Other financing activities, net |  |  | 33 |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 19 |  |  |  |  |  |  |
Currency Swap | Net Investment Hedges |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | £ 0 | € 6,143 |  | £ 2,180 | € 6,143 |

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