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Debt and Financing Activities - Long-Term Debt Narrative (Details) € in Millions, $ in Millions | Jul. 23, 2021 USD ($) | Jul. 17, 2021 USD ($) | Jul. 17, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  |  | $ 7,176 | $ 7,148
Current portion of long-term debt |  |  |  | $ 752 | $ 742
0.63% Euro Notes due August 17, 2021 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 0.63% |
0.63% Euro Notes due August 17, 2021 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  | 0.63% | 0.63% |  |
Debt principal redeemed |  | $ 709 | € 600 |  |
2.85% Notes due March 15, 2023 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 2.85% |
2.85% Notes due March 15, 2023 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 2.85% |  |  |  |
3.80% Notes due March 15, 2024 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 3.80% |
3.80% Notes due March 15, 2024 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 3.80% |  |  |  |
7.65% Debentures due March 1, 2027 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 7.65% |
7.65% Debentures due March 1, 2027 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 7.65% |  |  |  |
3.95% Notes due February 16, 2028 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 3.95% |
3.95% Notes due February 16, 2028 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 3.95% |  |  |  |
4.75% Notes due May 30, 2029 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 4.75% |
4.75% Notes due May 30, 2029 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 4.75% |  |  |  |
6.00% Notes due March 1, 2041 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 6.00% |
6.00% Notes due March 1, 2041 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 6.00% |  |  |  |
4.88% Notes due March 15, 2044 | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) |  |  |  | 4.88% |
4.88% Notes due March 15, 2044 | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on debt instrument (percent) | 4.88% |  |  |  |
Tender Offer Notes | Term Loan | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt principal redeemed | $ 922 |  |  |  |
Aggregate consideration of debt redeemed | $ 1,100 |  |  |  |
Redemption price percentage of principal (percent) | 100.00% |  |  |  |
Premiums | $ 182 |  |  |  |

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