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Debt (Medium-Term Notes) (Details) - USD ($) |  |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2046 | Apr. 01, 2036 | Apr. 01, 2026 | Apr. 01, 2023 | Apr. 01, 2021 | Mar. 29, 2019 | Oct. 15, 2015 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  | $ 7,931,200,000 |  | $ 0
$8.0 Billion Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | 8,000,000,000 |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  | 7,900,000,000 |  |
2.60% Senior Notes due 2019 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 2.60% |  |
Maturity date |  |  |  |  |  | Mar. 29, 2019 |  |  |  |
3.15% Senior Notes due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 1,000,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.15% |  |
Maturity date |  |  |  |  | Apr. 01, 2021 |  |  |  |  |
3.85% Senior Notes due 2023 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 1,750,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 3.85% |  |
Maturity date |  |  |  | Apr. 01, 2023 |  |  |  |  |  |
4.20% Senior Notes due 2026 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 4.20% |  |
Maturity date |  |  | Apr. 01, 2026 |  |  |  |  |  |  |
5.375% Senior Notes due 2036 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 500,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.375% |  |
Maturity date |  | Apr. 01, 2036 |  |  |  |  |  |  |  |
5.5% Senior Notes due 2046 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  |  | $ 1,750,000,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  | 5.50% |  |
Maturity date | Apr. 01, 2046 |  |  |  |  |  |  |  |  |
2.15% 2018 Note and 3.9% 2025 Note [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  | $ 600,000,000 |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | $ 594,600,000 |
2.15% 2018 Note due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  | $ 300,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 2.15% |  |  |
Maturity date |  |  |  |  |  |  | Oct. 15, 2018 |  |  |
3.9% 2025 Note due 2025 [Member] |  |  |  |  |  |  |  |  |  |
Principal amount of note |  |  |  |  |  |  | $ 300,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.90% |  |  |
Maturity date |  |  |  |  |  |  | Nov. 01, 2025 |  |  |

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