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Borrowings and Lines of Credit Borrowings and lines of Credit (Current Year Actions) (Details) € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2018 EUR (€) | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 11,000 |  |
Average Years of Maturity of Long Term Debt |  |  | 11 years | 11 years |
Average interest expense rate | 3.60% | 3.60% | 3.50% | 3.50% | 3.60%
Notes 3.350% Due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.35% |  | 3.35% | 3.35% |
Debt Instrument, Maturity Date, Description |  |  | 2021 | 2021 |
Proceeds from Issuance of Debt |  |  | $ 1,000 |  |
Notes 3.650% Due 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.65% |  | 3.65% | 3.65% |
Debt Instrument, Maturity Date, Description |  |  | 2023 | 2023 |
Proceeds from Issuance of Debt |  |  | $ 2,000 |  |
Notes 3.950% Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  | 3.95% | 3.95% |
Debt Instrument, Maturity Date, Description |  |  | 2025 | 2025 |
Proceeds from Issuance of Debt |  |  | $ 2,000 |  |
Notes 4.125% Due 2028 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.125% |  | 4.125% | 4.125% |
Debt Instrument, Maturity Date, Description |  |  | 2028 | 2028 |
Proceeds from Issuance of Debt |  |  | $ 3,000 |  |
Notes 4.450% Due 2038 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.45% |  | 4.45% | 4.45% |
Debt Instrument, Maturity Date, Description |  |  | 2038 | 2038 |
Proceeds from Issuance of Debt |  |  | $ 750 |  |
Notes 4.625% Due 2048 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.625% |  | 4.625% | 4.625% |
Debt Instrument, Maturity Date, Description |  |  | 2048 | 2048 |
Proceeds from Issuance of Debt |  |  | $ 2,000 |  |
LIBOR plus 0.650% floating rate notes due 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2021 | 2021 |
Proceeds from Issuance of Debt |  |  | $ 750 |  |
Notes 1.150% Due 2024 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.15% |  | 1.15% | 1.15% |
Debt Instrument, Maturity Date, Description |  |  | 2024 | 2024 |
Proceeds from Issuance of Debt | € |  |  |  | € 750 |
Notes 2.150% Due 2030 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.15% |  | 2.15% | 2.15% |
Debt Instrument, Maturity Date, Description |  |  | 2030 | 2030 |
Proceeds from Issuance of Debt | € |  |  |  | € 500 |
EURIBOR plus 0.20% floating rate notes due 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2020 | 2020 |
Proceeds from Issuance of Debt | € |  |  |  | € 750 |
Junior subordinated notes 1.778% due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.778% |  | 1.778% | 1.778% |
Debt Instrument, Maturity Date, Description |  |  | 2018 | 2018 |
Repayments of Debt |  |  | $ 1,000 |  |
Notes 6.800% Due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.80% |  | 6.80% | 6.80% |
Debt Instrument, Maturity Date, Description |  |  | 2018 | 2018 |
Repayments of Debt |  |  | $ 99 |  |
EURIBOR plus 0.800% floating rate notes due 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2018 | 2018 |
Repayments of Debt | € |  |  |  | € 750 |

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