Debt and Financing Activities - Long-Term Debt Narrative (Details) - USD ($) |
Dec. 03, 2020 |
Dec. 31, 2020 |
Dec. 01, 2020 |
Mar. 31, 2020 |
---|---|---|---|---|
Debt Instrument [Line Items] | ||||
Long-term debt | $ 7,244,000,000 | $ 7,387,000,000 | ||
Current portion of long-term debt | $ 777,000,000 | $ 1,052,000,000 | ||
0.90% Notes due December 3, 2025 | Term Loan | ||||
Debt Instrument [Line Items] | ||||
Interest rate on debt instrument (percent) | 0.90% | 0.90% | ||
Debt principal amount | $ 500,000,000 | |||
Proceeds from debt issuance | $ 496,000,000 | |||
Price as percentage of debt outstanding at which debt can be purchased | 101.00% | |||
3.65% Notes due November 30, 2020 | Term Loan | ||||
Debt Instrument [Line Items] | ||||
Interest rate on debt instrument (percent) | 3.65% | |||
Debt principal amount | $ 700,000,000 | |||
4.75% Notes due March 1, 2021 | Term Loan | ||||
Debt Instrument [Line Items] | ||||
Interest rate on debt instrument (percent) | 4.75% | 4.75% | ||
Debt principal amount | $ 323,000,000 |