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Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | [1] | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions |  |  |  |  | $ 62 | $ (16) | [2]
Net Unrealized Gains Losses on Non Otti Securities [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Non Otti Securities Adjustment, After Tax |  | $ 1,128 | $ (405) | $ 10 |  |  |
Net Unrealized Gains Losses On Otti Securities [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income Loss Otti Securities Adjustment After Tax |  | 19 | (11) | 109 |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  |  | (182) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 229 | (137) |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 122 | 12 | 107 |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Total Other, net activity, After tax |  | 22 | 1 | 38 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  | (725) |  |  |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 1,524 | (583) | 117 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance |  | 799 | (725) |  |  |  |
Net unrealized gains (losses) on non-OTTI securities |  |  |  |  |  |  |
Net Unrealized Gains Losses on Non Otti Securities [Abstract] |  |  |  |  |  |  |
Net unrealized gains (losses) on non-OTTI securities, after-tax, Beginning Balance |  | (284) | 62 | 52 |  |  |
Other Comprehensive Income (Loss), Non Otti Securities Adjustment, After Tax |  | 1,128 | (405) | 10 |  |  |
Net unrealized gains (losses) on non-OTTI securities, after-tax, Ending Balance |  | 844 | (284) | 62 |  |  |
Net unrealized gains (losses) on OTTI securities |  |  |  |  |  |  |
Net Unrealized Gains Losses On Otti Securities [Abstract] |  |  |  |  |  |  |
Net unrealized gains (losses) on OTTI securities, after tax, Beginning Balance |  | 204 | 215 | 106 |  |  |
Other Comprehensive Income Loss Otti Securities Adjustment After Tax |  | 19 | (11) | 109 |  |  |
Net unrealized gains (losses) on OTTI securities, after tax, Ending Balance |  | 223 | 204 | 215 |  |  |
Net unrealized gains (losses) on cash flow hedge derivatives |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  |  |  | (182) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 229 | (137) |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  | 47 | 151 | 333 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance |  | 276 | 47 | 151 |  |  |
Pension and other postretirement benefit plan adjustments |  |  |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |  |  |  |  |
Pension and other postretirement benefit plan adjustments, after tax, Beginning Balance |  | (530) | (446) | (553) |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax |  | 122 | 12 | 107 |  |  |
Pension and other postretirement benefit plan adjustments, after tax, Ending Balance |  | (408) | (530) | (446) |  |  |
Other |  |  |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Other, after tax, Beginning balance |  | (43) | (68) | (106) |  |  |
Total Other, net activity, After tax |  | 22 | 1 | 38 |  |  |
Other, after tax, Ending balance |  | (21) | (43) | (68) |  |  |
Total |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [2] |  |  |  |  | 6 |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  | (725) | (148) | (265) |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 1,524 | (583) | 117 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance |  | 799 | (725) | (148) |  |  |
Accounting Standards Update 2018-02 | Net unrealized gains (losses) on non-OTTI securities |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | 59 |
Accounting Standards Update 2018-02 | Net unrealized gains (losses) on cash flow hedge derivatives |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | 33 |
Accounting Standards Update 2018-02 | Pension and other postretirement benefit plan adjustments |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | (96) |
Accounting Standards Update 2018-02 | Other |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | 24 |
Accounting Standards Update 2018-02 | Total |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | 6 |
Continuing Operations |  |  |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 1,520 | (540) | 82 |  |  |
Continuing Operations | Total |  |  |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  | (606) | (86) | (168) |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 1,520 | (540) | 82 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance |  | 914 | (606) | (86) |  |  |
Continuing Operations | Accounting Standards Update 2018-02 | Total |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | 20 |
Discontinued Operations |  |  |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 4 | (43) | 35 |  |  |
Discontinued Operations | Total |  |  |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance |  | (119) | (62) | (97) |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income |  | 4 | (43) | 35 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance |  | $ (115) | $ (119) | $ (62) |  |  |
Discontinued Operations | Accounting Standards Update 2018-02 | Total |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Cumulative effect of ASU adoptions | [3] |  |  |  |  | $ (14) |
[1] | Represents the impact of the adoption of ASU 2016-02 related primarily to deferred gains on previous sale-leaseback transactions. See the Recently Adopted Accounting Standards portion of Note 1 Accounting Policies for additional detail.
[2] | Represents the cumulative effect of adopting ASU 2014-09, ASU 2016-01, ASU 2017-12 and ASU 2018-02. See the Recently Adopted Accounting Standards portion of Note 1 Accounting Policies in our 2018 Form 10-K for additional detail on the adoption of these ASUs.
[3] | Represents the cumulative impact of adopting ASU 2018-02 which permits the reclassification to retained earnings of the income tax effects stranded within AOCI. See the Recently Adopted Accounting Standards portion of Note 1 Accounting Policies in our 2018 Form 10-K for additional detail on this adoption.

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