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Borrowings and Lines of Credit (Long-Term Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Project financing obligations |  | $ 158 | $ 155
Total principal long-term debt |  | 27,118 | 23,299
Other debt (including capitalized leases) |  | 195 | 189
Other (fair market value adjustments, discounts and debt issuance costs) |  | (25) | 1
Total long-term debt |  | 27,093 | 23,300
Less: current portion |  | 2,104 | 1,603
Long-term debt, net of current portion |  | 24,989 | 21,697
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months |  | 2,104 |
Long Term Debt Maturities Repayments Of Principal In Year Two |  | 2,271 |
Long Term Debt Maturities Repayments Of Principal In Year Three |  | 2,479 |
Long Term Debt Maturities Repayments Of Principal In Year Four |  | 2,175 |
Long Term Debt Maturities Repayments Of Principal In Year Five |  | 2,804 |
Long Term Debt Maturities Repayments Of Principal After Year Five |  | 15,285 |
Notes 1.800% Due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 0 | 1,500
Debt Instrument, Interest Rate, Stated Percentage |  | 1.80% |
Debt Instrument, Maturity Year Date |  | 2017 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 6.800% Due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 99 | 99
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% |
Debt Instrument, Maturity Year Date |  | 2018 |
EURIBOR plus 0.800% floating rate notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [2] | $ 890 | 783
Debt Instrument, Maturity Year Date |  | 2018 |
Debt Instrument, Call Feature |  | The three-month EURIBOR rate as of December 30, 2017 was approximately -0.329%. 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. |
Junior subordinated notes 1.778% due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 1,100 | 1,100
Debt Instrument, Interest Rate, Stated Percentage |  | 1.778% |
Debt Instrument, Maturity Year Date |  | 2018 |
LIBOR plus 0.350% floating rate notes due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [3] | $ 350 | 350
Debt Instrument, Maturity Year Date |  | 2019 |
Debt Instrument, Call Feature |  | The three-month LIBOR rate as of December 30, 2017 was approximately 1.694%. |
Notes 1.500% Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 650 | 650
Debt Instrument, Interest Rate, Stated Percentage |  | 1.50% |
Debt Instrument, Maturity Year Date |  | 2019 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
EURIBOR plus 0.15% floating rate notes due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 890 | 0
Debt Instrument, Maturity Year Date |  | 2019 |
Debt Instrument, Call Feature |  | The three-month EURIBOR rate as of December 30, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments |
Notes 8.875% Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 271 | 271
Debt Instrument, Interest Rate, Stated Percentage |  | 8.875% |
Debt Instrument, Maturity Year Date |  | 2019 |
Notes 4.875% Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 171 | 171
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |
Debt Instrument, Maturity Year Date |  | 2020 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 4.500% Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,250 | 1,250
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |
Debt Instrument, Maturity Year Date |  | 2020 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 1.900% Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,000 | 0
Debt Instrument, Interest Rate, Stated Percentage |  | 1.90% |
Debt Instrument, Maturity Year Date |  | 2020 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 8.750% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 250 | 250
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% |
Debt Instrument, Maturity Year Date |  | 2021 |
Notes 1.950% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 750 | 750
Debt Instrument, Interest Rate, Stated Percentage |  | 1.95% |
Debt Instrument, Maturity Year Date |  | 2021 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 1.125% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,127 | 992
Debt Instrument, Interest Rate, Stated Percentage |  | 1.125% |
Debt Instrument, Maturity Year Date |  | 2021 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 2.300% Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 500 | 0
Debt Instrument, Interest Rate, Stated Percentage |  | 2.30% |
Debt Instrument, Maturity Year Date |  | 2022 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 3.100% Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 2,300 | 2,300
Debt Instrument, Interest Rate, Stated Percentage |  | 3.10% |
Debt Instrument, Maturity Year Date |  | 2022 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 1.250% due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 890 | 783
Debt Instrument, Interest Rate, Stated Percentage |  | 1.25% |
Debt Instrument, Maturity Year Date |  | 2023 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 2.800% Due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 800 | 0
Debt Instrument, Interest Rate, Stated Percentage |  | 2.80% |
Debt Instrument, Maturity Year Date |  | 2024 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 1.875% Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 593 | 522
Debt Instrument, Interest Rate, Stated Percentage |  | 1.875% |
Debt Instrument, Maturity Year Date |  | 2026 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 2.650% Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,150 | 1,150
Debt Instrument, Interest Rate, Stated Percentage |  | 2.65% |
Debt Instrument, Maturity Year Date |  | 2026 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 3.125% Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,100 | 0
Debt Instrument, Interest Rate, Stated Percentage |  | 3.125% |
Debt Instrument, Maturity Year Date |  | 2027 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 7.100% Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 141 | 141
Debt Instrument, Interest Rate, Stated Percentage |  | 7.10% |
Debt Instrument, Maturity Year Date |  | 2027 |
Notes 6.700% Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 400 | 400
Debt Instrument, Interest Rate, Stated Percentage |  | 6.70% |
Debt Instrument, Maturity Year Date |  | 2028 |
Notes 7.500% Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 550 | 550
Debt Instrument, Interest Rate, Stated Percentage |  | 7.50% |
Debt Instrument, Maturity Year Date |  | 2029 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 5.400% Due 2035 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 600 | 600
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% |
Debt Instrument, Maturity Year Date |  | 2035 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 6.050% Due 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 600 | 600
Debt Instrument, Interest Rate, Stated Percentage |  | 6.05% |
Debt Instrument, Maturity Year Date |  | 2036 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 6.800% Due 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 134 | 134
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% |
Debt Instrument, Maturity Year Date |  | 2036 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 7.000% Due 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount |  | $ 159 | 159
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% |
Debt Instrument, Maturity Year Date |  | 2038 |
Notes 6.125% Due 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,000 | 1,000
Debt Instrument, Interest Rate, Stated Percentage |  | 6.125% |
Debt Instrument, Maturity Year Date |  | 2038 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 5.700% Due 2040 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,000 | 1,000
Debt Instrument, Interest Rate, Stated Percentage |  | 5.70% |
Debt Instrument, Maturity Year Date |  | 2040 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 4.500% Due 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 3,500 | 3,500
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |
Debt Instrument, Maturity Year Date |  | 2042 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 4.150% Due 2045 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 850 | 850
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% |
Debt Instrument, Maturity Year Date |  | 2045 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 3.750% Due 2046 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 1,100 | 1,100
Debt Instrument, Interest Rate, Stated Percentage |  | 3.75% |
Debt Instrument, Maturity Year Date |  | 2046 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Notes 4.050% Due 2047 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Carrying Amount | [1] | $ 600 | $ 0
Debt Instrument, Interest Rate, Stated Percentage |  | 4.05% |
Debt Instrument, Maturity Year Date |  | 2047 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
[1] | We may redeem these notes at our option pursuant to their terms.
[2] | The three-month EURIBOR rate as of December 29, 2017 was approximately -0.329%. 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.
[3] | The three-month LIBOR rate as of December 29, 2017 was approximately 1.694%.

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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + 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/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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