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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 | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 USD ($) | Sep. 30, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 11,000 |
Average Years of Maturity of Long Term Debt |  |  | 10 years |  |  |
Average interest expense rate | 3.70% | 3.60% | 3.70% | 3.50% |  |
Notes 1.950% Due 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.95% |  | 1.95% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2019 |  |  |
Repayment of Debt, Date |  |  | Jul. 15, 2019 |  |  |
Repayments of Debt |  |  | $ 300 |  |  |
Notes 5.250% Due 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  | 5.25% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2019 |  |  |
Repayment of Debt, Date |  |  | Jul. 15, 2019 |  |  |
Repayments of Debt |  |  | $ 300 |  |  |
Notes 3.350% Due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.35% |  | 3.35% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2021 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
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% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2023 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
Proceeds from Issuance of Debt |  |  |  |  | $ 2,250 |
Notes 3.950% Due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  | 3.95% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2025 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
Proceeds from Issuance of Debt |  |  |  |  | $ 1,500 |
Notes 4.125% Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.125% |  | 4.125% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2028 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
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% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2038 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
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% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2048 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
Proceeds from Issuance of Debt |  |  |  |  | $ 1,750 |
LIBOR plus 0.650% floating rate notes due 2021 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2021 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Aug. 16, 2018 | Aug. 16, 2018
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% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2024 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | May 18, 2018 | May 18, 2018
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% |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2030 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | May 18, 2018 | May 18, 2018
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 |  |  |
Debt Instrument, Issuance Date |  |  |  |  | May 18, 2018 | May 18, 2018
Proceeds from Issuance of Debt | € |  |  |  |  |  | € 750
Variable-rate term loan due 2020 (1 month LIBOR plus 1.25%) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt, Date |  |  |  |  | Dec. 14, 2018 | Dec. 14, 2018
Repayments of Debt |  |  |  |  | $ 482 |
Junior subordinated notes 1.778% due 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt, Date |  |  |  |  | May 04, 2018 | May 04, 2018
Repayments of Debt |  |  |  |  | $ 1,100 |
EURIBOR plus 0.800% floating rate notes due 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt, Date |  |  |  |  | Feb. 22, 2018 | Feb. 22, 2018
Repayments of Debt | € |  |  |  |  |  | € 750
Notes 6.800% Due 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of Debt, Date |  |  |  |  | Feb. 01, 2018 | Feb. 01, 2018
Repayments of Debt |  |  |  |  | $ 99 |

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