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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Components of the plans' funded status reflected in the Consolidated Statements of Financial Position |
Components of the pension and other postretirement plans’ funded status reflected in the Consolidated Statements of Financial Position
|  | As of December 31,
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Fair value of plan assets |  | $ | 6,284 |  |  | $ | 5,650 |  |  | $ | — |  |  | $ | — |
Less: Benefit obligation |  | 6,815 |  |  | 6,591 |  |  | 386 |  |  | 373 |
Funded status |  | $ | (531 | ) |  | $ | (941 | ) |  | $ | (386 | ) |  | $ | (373 | )
Items not yet recognized as a component of net periodic cost: |  |  |  |  |  |  |  |
Net actuarial loss (gain) |  | $ | 2,224 |  |  | $ | 2,807 |  |  | $ | (218 | ) |  | $ | (251 | )
Prior service credit |  | (254 | ) |  | (310 | ) |  | (37 | ) |  | (62 | )
Unrecognized pension and other postretirement benefit cost, pre-tax |  | 1,970 |  |  | 2,497 |  |  | (255 | ) |  | (313 | )
Deferred income tax (1) |  | (419 | ) |  | (874 | ) |  | 51 |  |  | 109 |
Unrecognized pension and other postretirement benefit cost |  | $ | 1,551 |  |  | $ | 1,623 |  |  | $ | (204 | ) |  | $ | (204 | )
(1) | Components of the pension plan and other postretirement benefits were reduced by deferred income taxes at the newly enacted 21% U.S. corporate tax rate as of December 31, 2017 and 35% as of December 31, 2016.
Change during the period in items not yet recognized as a component of net periodic cost | The change in items not yet recognized as a component of net periodic cost is recorded in unrecognized pension and other postretirement benefit cost.
Changes in items not yet recognized as a component of net periodic cost
($ in millions) |  | Pension benefits |  | Postretirement benefits
Items not yet recognized as a component of net periodic cost – December 31, 2016 |  | $ | 2,497 |  |  | $ | (313 | )
Net actuarial (gain) loss arising during the period |  | (247 | ) |  | 8 |
Net actuarial (loss) gain amortized to net periodic benefit cost |  | (342 | ) |  | 24 |
Prior service credit amortized to net periodic benefit cost |  | 56 |  |  | 25 |
Translation adjustment and other |  | 6 |  |  | 1 |
Items not yet recognized as a component of net periodic cost – December 31, 2017 |  | $ | 1,970 |  |  | $ | (255 | )
Estimates of the net actuarial loss (gain) and prior service credit expected to be recognized as a component of net periodic benefit cost in next fiscal year | The net actuarial loss (gain) and prior service credit is recognized as a component of net periodic cost amortized over the average remaining service period of active employees expected to receive benefits.
Estimates of 2018 net actuarial loss (gain) and prior service credit
($ in millions) |  | Pension benefits |  | Postretirement benefits
Net actuarial loss (gain) |  | $ | 177 |  |  | $ | (22 | )
Prior service credit |  | (56 | ) |  | (22 | )
Changes in benefit obligations for all plans |
Changes in benefit obligations for all plans
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Benefit obligation, beginning of year |  | $ | 6,591 |  |  | $ | 6,130 |  |  | $ | 373 |  |  | $ | 405 |
Service cost |  | 114 |  |  | 113 |  |  | 8 |  |  | 9 |
Interest cost |  | 264 |  |  | 286 |  |  | 15 |  |  | 17 |
Participant contributions |  | — |  |  | 1 |  |  | 12 |  |  | 16 |
Actuarial loss (gain) |  | 395 |  |  | 387 |  |  | 8 |  |  | (14 | )
Benefits paid (1) |  | (553 | ) |  | (301 | ) |  | (35 | ) |  | (41 | )
Plan amendments |  | — |  |  | — |  |  | — |  |  | (22 | )
Translation adjustment and other |  | 4 |  |  | (25 | ) |  | 5 |  |  | 3 |
Benefit obligation, end of year |  | $ | 6,815 |  |  | $ | 6,591 |  |  | $ | 386 |  |  | $ | 373 |
(1) | Benefits paid include lump sum distributions, a portion of which triggered settlement accounting treatment.
Components of net periodic cost |
Components of net periodic cost
|  | For the years ended December 31,
|  | Pension benefits |  | Postretirement benefits
($ in millions) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Service cost |  | $ | 114 |  |  | $ | 113 |  |  | $ | 114 |  |  | $ | 8 |  |  | $ | 9 |  |  | $ | 12 |
Interest cost |  | 264 |  |  | 286 |  |  | 258 |  |  | 15 |  |  | 17 |  |  | 23 |
Expected return on plan assets |  | (409 | ) |  | (398 | ) |  | (424 | ) |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit |  | (56 | ) |  | (56 | ) |  | (56 | ) |  | (25 | ) |  | (21 | ) |  | (22 | )
Net actuarial loss (gain) |  | 189 |  |  | 174 |  |  | 190 |  |  | (24 | ) |  | (24 | ) |  | (9 | )
Settlement loss |  | 153 |  |  | 27 |  |  | 31 |  |  | — |  |  | — |  |  | — |
Net periodic cost (credit) |  | $ | 255 |  |  | $ | 146 |  |  | $ | 113 |  |  | $ | (26 | ) |  | $ | (19 | ) |  | $ | 4 |
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) |  | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Discount rate |  | 4.15 | % |  | 4.83 | % |  | 4.10 | % |  | 3.63 | % |  | 4.59 | % |  | 3.97 | %
Rate of increase in compensation levels |  | 3.20 |  |  | 3.20 |  |  | 3.50 |  |  | n/a |  |  | n/a |  |  | n/a |
Expected long-term rate of return on plan assets |  | 7.31 |  |  | 7.30 |  |  | 7.33 |  |  | n/a |  |  | n/a |  |  | n/a |
Weighted average assumptions used to determine benefit obligations
|  | For the years ended December 31,
|  | Pension benefits |  | Postretirement benefits
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate |  | 3.68 | % |  | 4.15 | % |  | 4.06 | % |  | 4.07 | %
Rate of increase in compensation levels |  | 3.20 |  |  | 3.20 |  |  | n/a |  |  | n/a |
Change in pension plan assets |
Change in pension plan assets
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016
Fair value of plan assets, beginning of year |  | $ | 5,650 |  |  | $ | 5,353 |
Actual return on plan assets |  | 1,051 |  |  | 491 |
Employer contribution |  | 131 |  |  | 131 |
Benefits paid |  | (553 | ) |  | (301 | )
Translation adjustment and other |  | 5 |  |  | (24 | )
Fair value of plan assets, end of year |  | $ | 6,284 |  |  | $ | 5,650 |
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, 2017
|  | Target asset allocation (1) |  | Actual percentage of plan assets
Pension plan’s asset category |  | 2017 |  | 2017 |  | 2016
Equity securities (2) |  | 43 - 62% |  | 58 | % |  | 62 | %
Fixed income securities |  | 34 - 44% |  | 34 |  |  | 29 |
Limited partnership interests |  | 0 - 13% |  | 6 |  |  | 7 |
Short-term investments and other |  | — |  | 2 |  |  | 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 include private equity investments that are subject to the limited partnership interests target allocation of 2% and 1% in 2017 and 2016, respectively, fixed income mutual funds that are subject to the fixed income securities target allocation of 3% for both 2017 and 2016 as well as 1% of equity exposure created through a derivative which is not included in the actual allocations in 2017.
(3) | Securities lending collateral reinvestment of $202 million and $143 million is excluded from the table above in 2017 and 2016, respectively.
Fair values of pension plan assets | stments.
Fair values of pension plan assets as of December 31, 2017
($ 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 (1) |  |  |  |  |  |  |  | 3,598 |
Securities lending obligation (2) |  |  |  |  |  |  |  | (216 | )
Other net plan assets (3) |  |  |  |  |  |  |  | 20 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 6,284 |
(1) | In 2017, the Company retrospectively adopted a new accounting standard for pension plans which eliminates the requirement to include investments in the fair value hierarchy for which fair value is measured using net asset value (“NAV”) per share practical expedient. As a result, certain pension plan investments that are measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy, including the related rollforward of Level 3 plan assets presented below. These investments comprised of $3.20 billion of equity investments and $402 million of limited partnerships.
(2) | The securities lending obligation represents the plan’s obligation to return securities lending collateral received under a securities lending program. The terms of the program allow both the plan and the counterparty the right and ability to redeem/return the securities loaned on short notice. Due to its relatively short-term nature, the outstanding balance of the obligation approximates fair value.
(3) | Other net plan assets represent interest and dividends receivable and net receivables related to settlements of investment transactions, such as purchases and sales.
Fair values of pension plan assets as of December 31, 2016
($ 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, 2016
Equity securities |  | $ | 155 |  |  | $ | 147 |  |  | $ | — |  |  | $ | 302 |
Fixed income securities: |  |  |  |  |  |  |  |
U.S. government and agencies |  | 30 |  |  | 285 |  |  | — |  |  | 315 |
Corporate |  | — |  |  | 1,309 |  |  | 10 |  |  | 1,319 |
Short-term investments |  | 144 |  |  | 121 |  |  | — |  |  | 265 |
Cash and cash equivalents |  | 32 |  |  | — |  |  | — |  |  | 32 |
Free-standing derivatives: |  |  |  |  |  |  |  |
Assets |  | (1 | ) |  | 1 |  |  | — |  |  | — |
Total plan assets at fair value |  | $ | 360 |  |  | $ | 1,863 |  |  | $ | 10 |  |  | 2,233 |
% of total plan assets at fair value |  | 16.1 | % |  | 83.4 | % |  | 0.5 | % |  | 100.0 | %
Investments measured using the Net Asset Value practical expedient |  |  |  |  |  |  |  | 3,525 |
Securities lending obligation |  |  |  |  |  |  |  | (158 | )
Other net plan assets |  |  |  |  |  |  |  | 50 |
Total reported plan assets |  |  |  |  |  |  |  | $ | 5,650 |
Rollforward of Level 3 plan assets |
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 |
Rollforward of level 3 plan assets during December 31, 2015
|  |  |  | Actual return on plan assets: |  |  |  |  |  |
($ in millions) |  | Balance as of December 31, 2014 |  | 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, 2015
Equity securities |  | $ | 1 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal |  | 14 |  |  | — |  |  | — |  |  | (7 | ) |  | — |  |  | 7 |
Corporate |  | 12 |  |  | — |  |  | — |  |  | — |  |  | (2 | ) |  | 10 |
Total Level 3 plan assets |  | $ | 27 |  |  | $ | 1 |  |  | $ | (1 | ) |  | $ | (7 | ) |  | $ | (2 | ) |  | $ | 18 |
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, 2017,
($ in millions) |  | Pension benefits |  | Postretirement benefits
2018 |  | $ | 426 |  |  | $ | 22 |
2019 |  | 463 |  |  | 24 |
2020 |  | 485 |  |  | 24 |
2021 |  | 514 |  |  | 25 |
2022 |  | 533 |  |  | 26 |
2023-2027 |  | 2,477 |  |  | 136 |
Total benefit payments |  | $ | 4,898 |  |  | $ | 257 |
Schedule of ESOP benefit |
ESOP benefit
|  | For the years December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
Interest expense recognized by ESOP |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Less: dividends accrued on ESOP shares |  | (1 | ) |  | (3 | ) |  | (3 | )
Cost of shares allocated |  | 3 |  |  | 7 |  |  | 10 |
Compensation expense |  | 2 |  |  | 5 |  |  | 8 |
Reduction of defined contribution due to ESOP |  | 38 |  |  | 60 |  |  | 73 |
ESOP benefit |  | $ | (36 | ) |  | $ | (55 | ) |  | $ | (65 | )

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