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Employee Benefit Plans (Reconciliation of Changes in Projected Benefit Obligation and Change in Plan Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets, beginning balance | $ 5,654 |  |
Fair value of plan assets, end balance | 6,073 | $ 5,654 |
Pension Plans | Qualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | 5,117 | 4,740 |
Projected benefit obligation at beginning of year | 4,887 | 4,355 |
Service cost | 122 | 115 | $ 116
Interest cost | 160 | 186 | 171
Amendments |  | 21 |
Actuarial (gains)/losses and changes in assumptions | 306 | 498 |
Benefits paid | (301) | (288) |
Projected benefit obligation at end of year | 5,174 | 4,887 | 4,355
Fair value of plan assets, beginning balance | 5,654 | 4,963 |
Actual return on plan assets | 720 | 979 |
Benefits paid | (301) | (288) |
Fair value of plan assets, end balance | 6,073 | 5,654 | 4,963
Funded status | 899 | 767 |
Noncurrent asset | 899 | 767 |
Net amount recognized on the consolidated balance sheet | 899 | 767 |
Prior service cost (credit) | 25 | 29 |
Net actuarial loss (gain) | 299 | 411 |
Amount recognized in AOCI | 324 | 440 |
Pension Plans | Nonqualified Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation at end of year | 258 | 259 |
Projected benefit obligation at beginning of year | 265 | 258 |
Service cost | 3 | 3 | 3
Interest cost | 8 | 10 | 9
Actuarial (gains)/losses and changes in assumptions | 17 | 25 |
Benefits paid | (30) | (31) |
Projected benefit obligation at end of year | 263 | 265 | 258
Fair value of plan assets, beginning balance |  |  |
Employer contribution | 30 | 31 |
Benefits paid | (30) | (31) |
Fair value of plan assets, end balance |  |  |
Funded status | (263) | (265) |
Current liability | (25) | (26) |
Noncurrent liability | (238) | (239) |
Net amount recognized on the consolidated balance sheet | (263) | (265) |
Net actuarial loss (gain) | 90 | 78 |
Amount recognized in AOCI | 90 | 78 |
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation at beginning of year | 333 | 322 |
Service cost | 4 | 4 | 5
Interest cost | 11 | 13 | 12
Actuarial (gains)/losses and changes in assumptions | 11 | 18 |
Participant contributions | 3 | 3 |
Benefits paid | (25) | (27) |
Projected benefit obligation at end of year | 337 | 333 | 322
Fair value of plan assets, beginning balance | 247 | 232 |
Actual return on plan assets | 14 | 15 |
Employer contribution | 23 | 24 |
Participant contributions | 3 | 3 |
Benefits paid | (25) | (27) |
Fair value of plan assets, end balance | 262 | 247 | $ 232
Funded status | (75) | (86) |
Current liability | (2) | (2) |
Noncurrent liability | (73) | (84) |
Net amount recognized on the consolidated balance sheet | (75) | (86) |
Prior service cost (credit) | 2 | 2 |
Net actuarial loss (gain) | 4 | 1 |
Amount recognized in AOCI | $ 6 | $ 3 |

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- Definition Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan. + 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 (r) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 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=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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=121641772&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&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=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -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 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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