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Summary of Significant Accounting Policies - Earnings per share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net Income Available to Stockholders | $ 2,391 | $ 2,548 | $ 1,784
Less: Net Income Allocated to Restricted stock awards | $ (14) | $ (13) | $ (14)
Basic Weighted Average Shares Outstanding | 2,234 | 2,258 | 2,266
Basic Earnings Per Share | $ 1.06 | $ 1.12 | $ 0.78
Unvested restricted stock awards |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive securities | 13 | 13 | 13
Convertible trust preferred securities |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive securities | 3 | 3 | 3
Class P |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Net Income Available to Stockholders | $ 2,377 | $ 2,535 | $ 1,770
Class P | Unvested restricted stock awards |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Awards outstanding | 13 |  |

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