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Stockholders' Equity And Accumulated Other Comprehensive Income (Loss) (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | May 15, 2029 | Sep. 15, 2025 | Sep. 15, 2024 | Apr. 21, 2021 | Dec. 31, 2020
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  | $ (29,000,000) | $ (28,000,000) | $ (23,000,000) | $ (23,000,000) | $ (57,000,000) |  |  |  |  |  |
Stock repurchase plan, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 |
Cash dividend declared (in dollars per share) |  | $ 0.155 |  | $ 0.155 |  | $ 0.31 | $ 0.31 |  |  |  |  |
Preferred stock |  | $ 1,659,000,000 |  |  |  | $ 1,659,000,000 |  |  |  |  |  | $ 1,656,000,000
Preferred Stock, Par Value Per Share (in dollars per share) |  | $ 1.00 |  |  |  | $ 1.00 |  |  |  |  |  | $ 1.00
Stock Repurchased During Period, Value |  | $ 167,000,000 |  |  |  |  |  |  |  |  |  |
Stock Repurchased during period related to the Company's deferred investment plan for its directors |  | 1,000 |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased |  | 8,000 |  |  |  |  |  |  |  |  |  |
us-gaap_SeriesAandBandCPreferredStockMember |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  | $ (46,000,000) | $ (46,000,000) |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
PreferredDividendsReductiontoRetainedEarningsatRedemption |  | $ 100,000,000 |  |  |  | 100,000,000 |  |  |  |  |  |
PreferredStockIssuanceCostsReductiontoNetIncome |  | 13,000,000 |  |  |  | 13,000,000 |  |  |  |  |  |
Preferred stock |  | 0 |  |  |  | 0 |  |  |  |  |  | $ 387,000,000
Preferred Stock, Redemption Amount |  | 500,000,000 |  |  |  | 500,000,000 |  |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  | 433,000,000 |  |  |  | 433,000,000 |  |  |  |  |  | 433,000,000
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  | 490,000,000 |  |  |  | 490,000,000 |  |  |  |  |  | 490,000,000
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock |  |  |  |  |  | (11,000,000) |  |  |  |  |  |
Preferred stock |  | 346,000,000 |  |  |  | 346,000,000 |  |  |  |  |  | 346,000,000
Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  | $ 390,000,000 |  |  |  | $ 390,000,000 |  |  |  |  |  | $ 0
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared (in dollars per share) | $ 0.17 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  |  | $ 67,000,000 |  |
PreferredDividendsReductiontoRetainedEarningsatRedemption |  |  |  |  |  |  |  |  |  | $ 52,000,000 |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Subsequent Event [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |
Subsequent Event [Member] | Series E Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity And Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
ExcessofRedemptionAmountOverCarryingAmount |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |

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