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Employee Benefit Plans - Net Periodic Benefits Cost and Other Recognized in the OCI (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | $ 4 | $ 4 | $ 2
Interest cost | 142 | 170 | 237
Expected return on plan assets | (227) | (267) | (311)
Amortization of actuarial loss | 49 | 56 | 56
Settlements | 0 | 750 |
Net periodic cost (benefit) | (32) | 713 | (16)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 49 | 56 | 56
Settlement loss | 0 | 750 | 0
Amortization of prior service credit | 0 | 0 | 0
Net loss arising during the year | (91) | (209) | (66)
Total | (42) | 597 | (10)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (2,008) | (1,966) | (2,563)
Prior service credit | 0 | 0 | 0
Total | (2,008) | (1,966) | (2,563)
Other Postretirement Benefits |  |  |
Defined Benefit Plan, Net Periodic Cost (Benefit) |  |  |
Service cost | 0 | 0 |
Interest cost | 7 | 8 | 11
Expected return on plan assets | (7) | (8) | (10)
Amortization of prior service credit | (7) | (7) | (6)
Amortization of actuarial loss | 6 | 5 | 5
Settlements |  | 0 |
Net periodic cost (benefit) | (1) | (2) | 0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) |  |  |
Amortization of actuarial loss | 6 | 5 | 5
Settlement loss | 0 | 0 | 0
Amortization of prior service credit | (6) | (7) | (6)
Net loss arising during the year | 3 | (12) | (4)
Total | 3 | (14) | (5)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract] |  |  |
Net loss | (120) | (129) | (122)
Prior service credit | 72 | 78 | 85
Total | $ (48) | $ (51) | $ (37)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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