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Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jan. 01, 2020
Net Unrealized Gains Losses on Non Otti Securities [Abstract] |  |  |  |  |
Other comprehensive income (loss), non otti securities adjustment, after tax |  | $ 535 |  | $ 1,027 |
Net Unrealized Gains Losses On Otti Securities [Abstract] |  |  |  |  |
Other comprehensive income loss otti securities adjustment after tax |  | 0 |  | 7 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification and tax | 9 | 196 | $ 614 | 273 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |  |  |
Pension and other postretirement benefit plan adjustments, net activity, After Tax | (13) | (65) | (4) | 47 |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |
Total other, net activity, after tax | 1 | (2) | (9) | 6 |
Net unrealized gains (losses) on securities without an allowance for credit losses |  |  |  |  |
Net unrealized gains (losses) on securities without an Allowance, net activity, after tax | 477 |  | 1,623 |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax, beginning balance |  |  | 799 |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 551 | 636 | 2,270 | 1,356 |
Accumulated other comprehensive income (loss), net of tax, ending balance | 3,069 |  | 3,069 |  |
Continuing Operations |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 410 | 664 | 2,155 | 1,360 |
Discontinued Operations [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 141 | (28) | 115 | (4) |
Net unrealized gains (losses) on non-OTTI securities [Member] |  |  |  |  |
Net Unrealized Gains Losses on Non Otti Securities [Abstract] |  |  |  |  |
Net unrealized gains (losses) on non-OTTI securities, after-tax, Beginning Balance |  | 208 |  | (284) |
Other comprehensive income (loss), non otti securities adjustment, after tax |  | 535 |  | 1,027 |
Net unrealized gains (losses) on non-OTTI securities, after-tax, Ending Balance |  | 743 |  | 743 |
Net unrealized gains (losses) on OTTI securities [Member] |  |  |  |  |
Net Unrealized Gains Losses On Otti Securities [Abstract] |  |  |  |  |
Net unrealized gains (losses) on OTTI securities, after tax, Beginning Balance |  | 211 |  | 204 |
Other comprehensive income loss otti securities adjustment after tax |  |  |  | 7 |
Net unrealized gains (losses) on OTTI securities, after tax, Ending Balance |  | 211 |  | 211 |
Net unrealized gains (losses) on cash flow hedge derivatives [Member] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax [Abstract] |  |  |  |  |
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Beginning balance | 881 | 124 | 276 | 47 |
Other comprehensive income (loss), derivatives qualifying as hedges, net of tax | 9 | 196 | 614 | 273 |
Net unrealized gains (losses) on cash flow hedge derivatives, after-tax, Ending balance | 890 | 320 | 890 | 320 |
Net unrealized gains (losses) on cash flow hedge derivatives [Member] | Accounting Standards Update 2016-03 [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |
Pension and other postretirement benefit plan adjustments [Member] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] |  |  |  |  |
Pension and other postretirement benefit plan adjustments, after tax, Beginning Balance | (399) | (418) | (408) | (530) |
Pension and other postretirement benefit plan adjustments, net activity, After Tax | (13) | (65) | (4) | 47 |
Pension and other postretirement benefit plan adjustments, after tax, Ending Balance | (412) | (483) | (412) | (483) |
Pension and other postretirement benefit plan adjustments [Member] | Accounting Standards Update 2016-03 [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |
Other [Member] |  |  |  |  |
Other Comprehensive Income Other Adjustments [Abstract] |  |  |  |  |
Other, after tax, Beginning balance | (31) | (35) | (21) | (43) |
Total other, net activity, after tax | 1 | (2) | (9) | 6 |
Other, after tax, Ending balance | (30) | (37) | (30) | (37) |
Total [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax, beginning balance | 2,518 | (5) | 799 | (725) |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 551 | 636 | 2,270 | 1,356 |
Accumulated other comprehensive income (loss), net of tax, ending balance | 3,069 | 631 | 3,069 | 631 |
Total [Member] | Accounting Standards Update 2016-03 [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |
Total [Member] | Continuing Operations |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax, beginning balance | 2,659 | 90 | 914 | (606) |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 410 | 664 | 2,155 | 1,360 |
Accumulated other comprehensive income (loss), net of tax, ending balance | 3,069 | 754 | 3,069 | 754 |
Total [Member] | Continuing Operations | Accounting Standards Update 2016-03 [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |
Total [Member] | Discontinued Operations [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Accumulated other comprehensive income (loss), net of tax, beginning balance | (141) | (95) | (115) | (119) |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 141 | (28) | 115 | (4) |
Accumulated other comprehensive income (loss), net of tax, ending balance |  | $ (123) |  | $ (123) |
Net unrealized gains (losses) on securities without an Allowance [Member] |  |  |  |  |
Net unrealized gains (losses) on securities without an allowance for credit losses |  |  |  |  |
Net unrealized gains (losses) on securities without an Allowance, after Tax, beginning balance | 2,213 |  | 844 |  |
Net unrealized gains (losses) on securities without an Allowance, net activity, after tax | 477 |  | 1,623 |  |
Net unrealized gains (losses) on securities without an Allowance, after Tax, ending balance | 2,690 |  | 2,690 |  |
Net unrealized gains (losses) on securities without an Allowance [Member] | Accounting Standards Update 2016-03 [Member] |  |  |  |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | 223
Net unrealized gains (losses) on securities with an Allowance [Member] |  |  |  |  |
Net unrealized gains (losses) on securities with an allowance for credit losses |  |  |  |  |
Net unrealized gains (losses) on securities with an Allowance, after Tax, beginning balance | (5) |  | 223 |  |
Net unrealized gains (losses) on securities with an Allowance, net activity, after tax | (64) |  | (69) |  |
Net unrealized gains (losses) on securities with an Allowance, after Tax, ending balance | $ (69) |  | $ (69) |  |
Other Comprehensive Income (Loss) Total [Abstract] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (223)

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