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Borrowings and Lines of Credit (Long-Term Debt) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |
Project financing obligations |  | $ 206 | $ 206 | $ 158
Other (including capitalized leases) |  | 197 | 197 | 195
Total principal long-term debt |  | 27,361 | 27,361 | 27,118
Other (fair market value adjustments and discounts) |  | (37) | (37) | (25)
Total long-term debt |  | 27,324 | 27,324 | 27,093
Less: current portion |  | 78 | 78 | 2,104
Long-term debt, net of current portion |  | $ 27,246 | $ 27,246 | 24,989
Notes 6.800% Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% | 6.80% |
Debt Instrument, Maturity Date, Description |  |  | 2018 |
Debt Instrument, Carrying Amount |  | $ 0 | $ 0 | 99
EURIBOR plus 0.800% floating rate notes due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2018 |
Debt Instrument, Call Feature |  |  | The three-month EURIBOR rate as of June 30, 2018 was approximately -0.321%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. |
Debt Instrument, Carrying Amount | [1] | $ 0 | $ 0 | 890
Debt Instrument, Interest Rate Terms |  | EURIBOR plus 0.800% floating rate notes due 2018 (€750 million principal value) 2 |  |
Junior subordinated notes 1.778% due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.778% | 1.778% |
Debt Instrument, Maturity Date, Description |  |  | 2018 |
Debt Instrument, Carrying Amount |  | $ 0 | $ 0 | 1,100
LIBOR plus 0.350% floating rate notes due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2019 |
Debt Instrument, Call Feature |  |  | The three-month LIBOR rate as of June 30, 2018 was approximately 2.336%. |
Debt Instrument, Carrying Amount | [2] | $ 350 | $ 350 | 350
Debt Instrument, Interest Rate Terms |  |  | LIBOR plus 0.350% floating rate notes due 2019 3 |
Notes 1.500% notes 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.50% | 1.50% |
Debt Instrument, Maturity Date, Description |  |  | 2019 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 650 | $ 650 | 650
EURIBOR plus 0.15% floating rate notes due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 0.15% | 0.15% |
Debt Instrument, Maturity Date, Description |  |  | 2019 |
Debt Instrument, Call Feature |  |  | The three-month EURIBOR rate as of June 30, 2018 was approximately -0.321%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. |
Debt Instrument, Carrying Amount | [1] | $ 876 | $ 876 | 890
Debt Instrument, Interest Rate Terms |  | EURIBOR plus 0.15% floating rate notes due 2019 (€750 million principal value) 2 |  |
Notes 8.875% Due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.875% | 8.875% |
Debt Instrument, Maturity Date, Description |  |  | 2019 |
Debt Instrument, Carrying Amount |  | $ 271 | $ 271 | 271
Notes 4.875% Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% | 4.875% |
Debt Instrument, Maturity Date, Description |  |  | 2020 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 171 | $ 171 | 171
Notes 4.500% Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% | 4.50% |
Debt Instrument, Maturity Date, Description |  |  | 2020 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,250 | $ 1,250 | 1,250
Notes 1.900% Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.90% | 1.90% |
Debt Instrument, Maturity Date, Description |  |  | 2020 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,000 | $ 1,000 | 1,000
EURIBOR plus 0.20% floating rate notes due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Maturity Date, Description |  |  | 2020 |
Debt Instrument, Call Feature |  |  | The three-month EURIBOR rate as of June 30, 2018 was approximately -0.321%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. |
Debt Instrument, Carrying Amount | [1] | $ 876 | $ 876 | 0
Debt Instrument, Interest Rate Terms |  | EURIBOR plus 0.20% floating rate notes due 2020 (€750 million principal value) 2 |  |
Notes 8.750% Due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% | 8.75% |
Debt Instrument, Maturity Date, Description |  |  | 2021 |
Debt Instrument, Carrying Amount |  | $ 250 | $ 250 | 250
Notes 1.950% Due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.95% | 1.95% |
Debt Instrument, Maturity Date, Description |  |  | 2021 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 750 | $ 750 | 750
Note 1.125% Due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.125% | 1.125% |
Debt Instrument, Maturity Date, Description |  |  | 2021 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [2] | $ 1,110 | $ 1,110 | 1,127
Notes 2.300% Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.30% | 2.30% |
Debt Instrument, Maturity Date, Description |  |  | 2022 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 500 | $ 500 | 500
Notes 3.100% Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.10% | 3.10% |
Debt Instrument, Maturity Date, Description |  |  | 2022 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 2,300 | $ 2,300 | 2,300
Notes 1.250% due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.25% | 1.25% |
Debt Instrument, Maturity Date, Description |  |  | 2023 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [2] | $ 876 | $ 876 | 890
Notes 2.800% Due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.80% | 2.80% |
Debt Instrument, Maturity Date, Description |  |  | 2024 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 800 | $ 800 | 800
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, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [2] | $ 876 | $ 876 | 0
Notes 1.875% Due 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.875% | 1.875% |
Debt Instrument, Maturity Date, Description |  |  | 2026 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 584 | $ 584 | 593
Notes 2.650% Due 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.65% | 2.65% |
Debt Instrument, Maturity Date, Description |  |  | 2026 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,150 | $ 1,150 | 1,150
Notes 3.125% Due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.125% | 3.125% |
Debt Instrument, Maturity Date, Description |  |  | 2027 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,100 | $ 1,100 | 1,100
Notes 7.100% Due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.10% | 7.10% |
Debt Instrument, Maturity Date, Description |  |  | 2027 |
Debt Instrument, Carrying Amount |  | $ 141 | $ 141 | 141
Notes 6.700% Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.70% | 6.70% |
Debt Instrument, Maturity Date, Description |  |  | 2028 |
Debt Instrument, Carrying Amount |  | $ 400 | $ 400 | 400
Notes 7.500% Due 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.50% | 7.50% |
Debt Instrument, Maturity Date, Description |  |  | 2029 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 550 | $ 550 | 550
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, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 584 | $ 584 | 0
Notes 5.400% Due 2035 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% | 5.40% |
Debt Instrument, Maturity Date, Description |  |  | 2035 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 600 | $ 600 | 600
Notes 6.050% Due 2036 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.05% | 6.05% |
Debt Instrument, Maturity Date, Description |  |  | 2036 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 600 | $ 600 | 600
Notes 6.800% Due 2036 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% | 6.80% |
Debt Instrument, Maturity Date, Description |  |  | 2036 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 134 | $ 134 | 134
Notes 7.000% Due 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% | 7.00% |
Debt Instrument, Maturity Date, Description |  |  | 2038 |
Debt Instrument, Carrying Amount |  | $ 159 | $ 159 | 159
Notes 6.125% Due 2038 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.125% | 6.125% |
Debt Instrument, Maturity Date, Description |  |  | 2038 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,000 | $ 1,000 | 1,000
Notes 5.700% Due 2040 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.70% | 5.70% |
Debt Instrument, Maturity Date, Description |  |  | 2040 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,000 | $ 1,000 | 1,000
Notes 4.500% Due 2042 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% | 4.50% |
Debt Instrument, Maturity Date, Description |  |  | 2042 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 3,500 | $ 3,500 | 3,500
Notes 4.150% Due 2045 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% | 4.15% |
Debt Instrument, Maturity Date, Description |  |  | 2045 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 850 | $ 850 | 850
Notes 3.750% Due 2046 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.75% | 3.75% |
Debt Instrument, Maturity Date, Description |  |  | 2046 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,100 | $ 1,100 | 1,100
Notes 4.050% Due 2047 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.05% | 4.05% |
Debt Instrument, Maturity Date, Description |  |  | 2047 |
Debt Instrument, Call Feature |  |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 600 | $ 600 | $ 600
[1] | The three-month EURIBOR rate as of June 30, 2018 was approximately -0.321%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.
[2] | The three-month LIBOR rate as of June 30, 2018 was approximately 2.336%.
[3] | We may redeem these notes at our option pursuant to their terms.

X
- Definition Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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