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Share-based Compensation and Employee Benefits - Schedule of Components of Net Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits |  |  |
Components of net benefit cost (credit): |  |  |
Service cost | $ 53 | $ 52 | $ 40
Interest cost | 96 | 84 | 88
Expected return on assets | (129) | (149) | (147)
Amortization of prior service cost (credit) | 0 | 0 | 1
Amortization of net actuarial loss (gain) | 54 | 40 | 52
Curtailment and settlement loss | 0 | 0 | 5
Net benefit cost (credit) | 74 | 27 | 39
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net (gain) loss arising during period | (42) | 105 | 17
Amortization or settlement recognition of net actuarial (loss) gain | (54) | (87) | (64)
Amortization of prior service (cost) credit | 0 | (1) | (1)
Total recognized in total other comprehensive (income) loss | (96) | 17 | (48)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss | (22) | 44 | (9)
OPEB |  |  |
Components of net benefit cost (credit): |  |  |
Service cost | 1 | 1 | 1
Interest cost | 12 | 12 | 13
Expected return on assets | (16) | (20) | (19)
Amortization of prior service cost (credit) | (4) | (4) | (3)
Amortization of net actuarial loss (gain) | (11) | (6) | (6)
Curtailment and settlement loss | 0 | 0 | 0
Net benefit cost (credit) | (18) | (17) | (14)
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss: |  |  |
Net (gain) loss arising during period | (17) | (32) | (25)
Amortization or settlement recognition of net actuarial (loss) gain | 11 | 3 | 6
Amortization of prior service (cost) credit | 2 | 3 | 1
Total recognized in total other comprehensive (income) loss | (4) | (26) | (18)
Total recognized in net benefit cost (credit) and other comprehensive (income) loss | $ (22) | $ (43) | $ (32)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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