v3.8.0.1

Employee Benefit Plans (Amounts Recorded in Accumulated Other Comprehensive Income not yet Recognized) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | $ 3,456 |  |
Amortization for the period | 191 | $ 181 | $ 168
Deferrals for the period | (871) | (602) |
Impact of foreign currency changes and other | 66 | 43 |
Balance, end of period | 3,589 | 3,456 |
Pension Benefits | Transition Obligation |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 0 | 0 | 0
Amortization for the period | 0 | 0 | 0
Deferrals for the period | 0 | 0 | 0
Impact of foreign currency changes and other | 0 | 0 | 0
Balance, end of period | 0 | 0 | 0
Pension Benefits | Prior Service Cost |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | (25) | (33) | (42)
Amortization for the period | 3 | 6 | 8
Deferrals for the period | 0 | 3 | 0
Impact of foreign currency changes and other | 0 | (1) | 1
Balance, end of period | (22) | (25) | (33)
Pension Benefits | Net Actuarial (Gain) Loss |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 3,481 | 3,173 | 2,946
Amortization for the period | (191) | (181) | (168)
Deferrals for the period | 323 | 473 | 405
Impact of foreign currency changes and other | (2) | 16 | (10)
Balance, end of period | 3,611 | 3,481 | 3,173
Other Postretirement Benefits |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 558 |  |
Amortization for the period | 36 | 41 | 38
Deferrals for the period | 69 | 46 |
Impact of foreign currency changes and other | 3 | 1 |
Balance, end of period | 354 | 558 |
Other Postretirement Benefits | Transition Obligation |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 0 | 0 | 0
Amortization for the period | 0 | 0 | 0
Deferrals for the period | 0 | 0 | 0
Impact of foreign currency changes and other | 0 | 0 | 0
Balance, end of period | 0 | 0 | 0
Other Postretirement Benefits | Prior Service Cost |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 1 | (1) | (8)
Amortization for the period | 0 | 2 | 5
Deferrals for the period | 9 | 0 | 2
Impact of foreign currency changes and other | 0 | 0 | 0
Balance, end of period | 10 | 1 | (1)
Other Postretirement Benefits | Net Actuarial (Gain) Loss |  |  |
Pension And Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Before Tax [Roll Forward] |  |  |
Balance, beginning of year | 557 | 621 | 600
Amortization for the period | (36) | (41) | (38)
Deferrals for the period | (179) | (23) | 63
Impact of foreign currency changes and other | 2 | 0 | (4)
Balance, end of period | $ 344 | $ 557 | $ 621

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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