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Long Term Debt and Other Borrowings - Senior Notes Narrative (Detail) - Senior notes - USD ($) | Jun. 07, 2016 | Mar. 12, 2015 | Jun. 26, 2016 | Oct. 20, 2015 | Mar. 31, 2015
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  |  | $ 2,400,000,000 | $ 1,000,000,000
2.75% Notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |
Interest rate percentage |  | 2.75% | 2.75% |  |
Percentage of principal amount of debt redeemed |  | 100.00% |  |  |
Debt instrument, redemption price (percentage) |  | 101.00% |  |  |
3.80% Notes due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 500,000,000 |  |  |
Interest rate percentage |  | 3.80% | 3.80% |  |
Percentage of principal amount of debt redeemed |  | 100.00% |  |  |
Debt instrument, redemption price (percentage) |  | 101.00% |  |  |
2.80 Notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 800,000,000 |  |  |  |
Interest rate percentage | 2.80% |  | 2.80% |  |
Percentage of principal amount of debt redeemed | 100.00% |  |  |  |
Debt instrument, redemption price (percentage) | 101.00% |  |  |  |
Special Mandatory Redemption Event, days to notify note holders | 5 days |  |  |  |
Special Mandatory Redemption Date, days after notice | 3 days |  |  |  |
3.45% Notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 600,000,000 |  |  |  |
Interest rate percentage | 3.45% |  | 3.45% |  |
Percentage of principal amount of debt redeemed | 100.00% |  |  |  |
Debt instrument, redemption price (percentage) | 101.00% |  |  |  |
3.90% Notes due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 1,000,000,000 |  |  |  |
Interest rate percentage | 3.90% |  | 3.90% |  |
Percentage of principal amount of debt redeemed | 100.00% |  |  |  |
Debt instrument, redemption price (percentage) | 101.00% |  |  |  |

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