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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Change in pension plan assets |
Change in projected benefit obligation, plan assets and funded status
|  | As of December 31,
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Change in projected benefit obligation |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 6,815 |  |  | $ | 6,591 |  |  | $ | 386 |  |  | $ | 373 |
Service cost |  | 110 |  |  | 111 |  |  | 7 |  |  | 8 |
Interest cost |  | 255 |  |  | 254 |  |  | 15 |  |  | 15 |
Participant contributions |  | — |  |  | — |  |  | 13 |  |  | 12 |
Actuarial (gains) losses |  | (255 | ) |  | 406 |  |  | (4 | ) |  | 8 |
Benefits paid |  | (646 | ) |  | (553 | ) |  | (35 | ) |  | (35 | )
Translation adjustment and other |  | (55 | ) |  | 6 |  |  | (7 | ) |  | 5 |
Benefit obligation, end of year |  | $ | 6,224 |  |  | $ | 6,815 |  |  | $ | 375 |  |  | $ | 386 |
Change in plan assets |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year |  | $ | 6,284 |  |  | $ | 5,650 |  |  |  |  |
Actual return on plan assets |  | (300 | ) |  | 1,051 |  |  |  |  |
Employer contribution |  | 16 |  |  | 131 |  |  |  |  |
Benefits paid |  | (646 | ) |  | (553 | ) |  |  |  |
Translation adjustment and other |  | (55 | ) |  | 5 |  |  |  |  |
Fair value of plan assets, end of year |  | $ | 5,299 |  |  | $ | 6,284 |  |  |  |  |
Funded status (1) (2) (3) |  | $ | (925 | ) |  | $ | (531 | ) |  | $ | (375 | ) |  | $ | (386 | )
Amounts recognized in AOCI |  |  |  |  |  |  |  |
Unamortized pension and other postretirement prior service credit |  | $ | (198 | ) |  | $ | (254 | ) |  | $ | (16 | ) |  | $ | (37 | )
(1) | The primary qualified employee plan represents 78% of the pension benefits’ underfunded status as of December 31, 2018.
(2) | The funded status is recorded within other liabilities and accrued expenses on the Consolidated Statements of Financial Position.
(3) | The Company’s other postretirement benefit plans are not funded.
Change during the period in items not yet recognized as a component of net periodic cost |
(2) | The funded status is recorded within other liabilities and accrued expenses on the Consolidated Statements of Financial Position.
(3) | The Company’s other postretirement benefit plans are not funded.
Changes in items not yet recognized as a component of net cost for pension and other postretirement plans
($ in millions) |  | Pension benefits |  | Postretirement benefits
Items not yet recognized as a component of net cost – December 31, 2017 |  | $ | (254 | ) |  | $ | (37 | )
Prior service credit amortized to net cost |  | 56 |  |  | 21 |
Items not yet recognized as a component of net cost – December 31, 2018 |  | $ | (198 | ) |  | $ | (16 | )
Components of net periodic cost |
Components of net cost (benefit) for pension and other postretirement plans
|  | For the years ended December 31,
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Service cost |  | $ | 110 |  |  | $ | 111 |  |  | $ | 113 |  |  | $ | 7 |  |  | $ | 8 |  |  | $ | 9 |
Interest cost |  | 255 |  |  | 254 |  |  | 286 |  |  | 15 |  |  | 15 |  |  | 18 |
Expected return on plan assets |  | (427 | ) |  | (419 | ) |  | (387 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service credit |  | (56 | ) |  | (56 | ) |  | (56 | ) |  | (21 | ) |  | (25 | ) |  | (21 | )
Costs and expenses |  | (118 | ) |  | (110 | ) |  | (44 | ) |  | 1 |  |  | (2 | ) |  | 6 |
Remeasurement of projected benefit obligation |  | (255 | ) |  | 406 |  |  | 388 |  |  | (4 | ) |  | 8 |  |  | (14 | )
Remeasurement of plan assets |  | 727 |  |  | (631 | ) |  | (104 | ) |  | — |  |  | — |  |  | — |
Remeasurement gains and losses |  | 472 |  |  | (225 | ) |  | 284 |  |  | (4 | ) |  | 8 |  |  | (14 | )
Total net cost (benefit) |  | $ | 354 |  |  | $ | (335 | ) |  | $ | 240 |  |  | $ | (3 | ) |  | $ | 6 |  |  | $ | (8 | )
Weighted average assumptions used to determine for pension plans and postretirement benefits plans the net benefit cost and benefit obligation |
Weighted average assumptions used to determine net pension cost and net postretirement benefit cost
|  | For the years ended December 31,
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Discount rate |  | 4.06 | % |  | 3.96 | % |  | 4.78 | % |  | 3.95 | % |  | 3.91 | % |  | 4.56 | %
Rate of increase in compensation levels |  | 3.15 |  |  | 3.16 |  |  | 3.16 |  |  | n/a |  |  | n/a |  |  | n/a |
Expected long-term rate of return on plan assets |  | 7.33 |  |  | 7.32 |  |  | 7.30 |  |  | n/a |  |  | n/a |  |  | n/a |
Weighted average assumptions used to determine benefit obligations
|  | For the years ended December 31,
|  | Pension benefits |  | Postretirement benefits
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Discount rate |  | 4.31 | % |  | 3.67 | % |  | 4.22 | % |  | 3.63 | %
Rate of increase in compensation levels |  | 3.16 |  |  | 3.15 |  |  | n/a |  |  | n/a |
Pension plans' weighted average target asset allocation and the actual percentage of plan assets |
Weighted average target asset allocation and actual percentage of plan assets by asset category
|  | As of December 31, 2018
|  | Target asset allocation (1) |  | Actual percentage of plan assets
Pension plan’s asset category |  | 2018 |  | 2018 |  | 2017
Equity securities (2) |  | 36 - 53% |  | 47 | % |  | 58 | %
Fixed income securities |  | 40 - 53% |  | 41 |  |  | 34 |
Limited partnership interests |  | 0 - 15% |  | 9 |  |  | 6 |
Short-term investments and other |  | — |  | 3 |  |  | 2 |
Total without securities lending (3) |  |  |  | 100 | % |  | 100 | %
(1) | The target asset allocation considers risk based exposure while the actual percentage of plan assets utilizes a financial reporting view excluding exposure provided through derivatives.
(2) | The actual percentage of plan assets for equity securities includes 1% and 2% of private equity investments in 2018 and 2017, respectively, that are subject to the limited partnership interests target allocation and 4% and 3% of fixed income mutual funds in 2018 and 2017, respectively, that are subject to the fixed income securities target allocation.
(3) | Securities lending collateral reinvestment of $208 million and $202 million is excluded from the table above in 2018 and 2017, respectively.
Fair values of pension plan assets |
Fair values of pension plan assets as of December 31, 2018
($ in millions) |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Balance as of December 31, 2018
Equity securities |  | $ | 51 |  |  | $ | 265 |  |  | $ | — |  |  | $ | 316 |
Fixed income securities: |  |  |  |  |  |  |  |
U.S. government and agencies |  | 172 |  |  | 509 |  |  | — |  |  | 681 |
Corporate |  | — |  |  | 1,479 |  |  | 5 |  |  | 1,484 |
Short-term investments |  | 122 |  |  | 198 |  |  | — |  |  | 320 |
Free-standing derivatives: |  |  |  |  |  |  |  |
Assets |  | — |  |  | 19 |  |  | — |  |  | 19 |
Liabilities |  | — |  |  | (11 | ) |  | — |  |  | (11 | )
Total plan assets at fair value |  | $ | 345 |  |  | $ | 2,459 |  |  | $ | 5 |  |  | 2,809 |
% of total plan assets at fair value |  | 12.3 | % |  | 87.5 | % |  | 0.2 | % |  | 100.0 | %
Investments measured using the net asset value practical expedient |  |  |  |  |  |  |  | 2,687 |
Securities lending obligation (1) |  |  |  |  |  |  |  | (222 | )
Derivatives Counterparty and Cash Collateral Netting |  |  |  |  |  |  |  | (6 | )
Other net plan assets (2) |  |  |  |  |  |  |  | 31 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 5,299 |
(1) | The securities lending obligation represents the plan’s obligation to return securities lending collateral received under a securities lending program. The terms of the program allow both the plan and the counterparty the right and ability to redeem/return the securities loaned on short notice. Due to its relatively short-term nature, the outstanding balance of the obligation approximates fair value.
(2) | Other net plan assets represent cash and cash equivalents, interest and dividends receivable and net receivables related to settlements of investment transactions, such as purchases and sales.
Fair values of pension plan assets as of December 31, 2017
($ in millions) |  | Quoted prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Balance as of December 31, 2017
Equity securities |  | $ | 126 |  |  | $ | 264 |  |  | $ | 29 |  |  | $ | 419 |
Fixed income securities: |  |  |  |  |  |  |  |
U.S. government and agencies |  | 174 |  |  | 420 |  |  | — |  |  | 594 |
Corporate |  | — |  |  | 1,543 |  |  | 10 |  |  | 1,553 |
Short-term investments |  | 97 |  |  | 197 |  |  | — |  |  | 294 |
Cash and cash equivalents |  | 21 |  |  | — |  |  | — |  |  | 21 |
Free-standing derivatives: |  |  |  |  |  |  |  |
Assets |  | — |  |  | 1 |  |  | — |  |  | 1 |
Total plan assets at fair value |  | $ | 418 |  |  | $ | 2,425 |  |  | $ | 39 |  |  | 2,882 |
% of total plan assets at fair value |  | 14.5 | % |  | 84.1 | % |  | 1.4 | % |  | 100.0 | %
Investments measured using the net asset value practical expedient |  |  |  |  |  |  |  | 3,598 |
Securities lending obligation |  |  |  |  |  |  |  | (216 | )
Other net plan assets |  |  |  |  |  |  |  | 20 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 6,284 |
Rollforward of Level 3 plan assets |
Rollforward of Level 3 plan assets during December 31, 2018
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2017 |  | Relating to assets sold during the period |  | Relating to assets still held at the reporting date |  | Purchases, sales and settlements, net |  | Net transfers in and/or (out) of Level 3 |  | Balance as of December 31, 2018
Equity securities |  | $ | 29 |  |  | $ | — |  |  | $ | 3 |  |  | $ | — |  |  | $ | (32 | ) |  | $ | — |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | 10 |  |  | — |  |  | — |  |  | (5 | ) |  | — |  |  | 5 |
Total Level 3 plan assets |  | $ | 39 |  |  | $ | — |  |  | $ | 3 |  |  | $ | (5 | ) |  | $ | (32 | ) |  | $ | 5 |
Rollforward of Level 3 plan assets during December 31, 2017
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2016 |  | Relating to assets sold during the period |  | Relating to assets still held at the reporting date |  | Purchases, sales and settlements, net |  | Net transfers in and/or (out) of Level 3 |  | Balance as of December 31, 2017
Equity securities |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 29 |  |  | $ | — |  |  | $ | 29 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Corporate |  | 10 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10 |
Total Level 3 plan assets |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 29 |  |  | $ | — |  |  | $ | 39 |
Rollforward of Level 3 plan assets during December 31, 2016
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2015 |  | Relating to assets sold during the period |  | Relating to assets still held at the reporting date |  | Purchases, sales and settlements, net |  | Net transfers in and/or (out) of Level 3 |  | Balance as of December 31, 2016
Equity securities |  | $ | 1 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal |  | 7 |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | — |
Corporate |  | 10 |  |  | — |  |  | — |  |  | (5 | ) |  | 5 |  |  | 10 |
Total Level 3 plan assets |  | $ | 18 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (12 | ) |  | $ | 5 |  |  | $ | 10 |
Estimated future benefit payments expected to be paid |
Estimated future benefit payments expected to be paid in the next 10 years
|  | As of December 31, 2018
($ in millions) |  | Pension benefits |  | Postretirement benefits
2019 |  | $ | 448 |  |  | $ | 24 |
2020 |  | 462 |  |  | 25 |
2021 |  | 495 |  |  | 26 |
2022 |  | 509 |  |  | 27 |
2023 |  | 528 |  |  | 28 |
2024-2028 |  | 2,383 |  |  | 142 |
Total benefit payments |  | $ | 4,825 |  |  | $ | 272 |
Schedule of ESOP benefit |
ESOP benefit
|  | For the years December 31,
($ in millions) |  | 2018 |  | 2017 |  | 2016
Interest expense recognized by ESOP |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Less: dividends accrued on ESOP shares |  | (1 | ) |  | (1 | ) |  | (3 | )
Cost of shares allocated |  | — |  |  | 3 |  |  | 7 |
Compensation expense |  | (1 | ) |  | 2 |  |  | 5 |
Reduction of defined contribution due to ESOP |  | 1 |  |  | 38 |  |  | 60 |
ESOP benefit |  | $ | (2 | ) |  | $ | (36 | ) |  | $ | (55 | )

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